| 575614
|
|
{inc} Resizing window is slow for long list with multicol (from "-moz-column-count: 3" or "column-width: 20em;")
|
Core
|
Layout: Columns
|
nobody
|
NEW
|
---
|
2020-08-17
|
| 613498
|
|
Very slow chrome to content DOM access
|
Core
|
XPConnect
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 614163
|
|
Slow property access on dromaeo's "jQuery -attr(class) x 100" benchmark
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-04-08
|
| 646937
|
|
throttle animation in completely obscured windows (virtual desktop, minimised, hidden behind other fullscreened windows)
|
Core
|
Widget
|
nobody
|
NEW
|
---
|
2021-02-18
|
| 651049
|
|
Write a new off-the-main-thread IO driver for expat
|
Core
|
XML
|
nobody
|
NEW
|
---
|
2020-03-05
|
| 661768
|
|
Defer history lookup on anchor creation
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2020-03-13
|
| 734643
|
|
Extremely slow deleting from history (seems some O(n^2) algorithm is there)
|
Firefox
|
Bookmarks & History
|
nobody
|
NEW
|
---
|
2021-05-20
|
| 760888
|
|
IE10 Test Drive: ParticleAcceleration Canvas 2D demo is slow
|
Core
|
Canvas: 2D
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 803709
|
|
We appear to be copying large data URIs over and over in nsSimpleURI.
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2020-08-10
|
| 827440
|
|
nsIconChannel::AsyncOpen can block
|
Core
|
ImageLib
|
nobody
|
NEW
|
---
|
2018-01-16
|
| 827937
|
|
Opening huge mercurial long commit page freezing Firefox
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2021-04-17
|
| 920187
|
|
Deprecate and get rid of FileUtils.getFile()
|
Toolkit
|
General
|
nobody
|
NEW
|
---
|
2020-07-13
|
| 936338
|
|
Chrome is more responsive on the D3.js based MIT Media Lab's Immersion application
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2018-12-18
|
| 984690
|
|
Optimize GetRootPresContext() to avoid going through the viewmanager / view tree
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2020-10-30
|
| 1097376
|
|
Poor performance in Ember app Discourse
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-08-10
|
| 1107626
|
|
Evaluate aggregating timers to reduce the number of times we wake up the CPU for serving them
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2021-02-05
|
| 1138151
|
|
Scrolling on some specific pages causes Firefox to use HDD constantly and loudly
|
Toolkit
|
Places
|
nobody
|
NEW
|
---
|
2019-11-29
|
| 1162665
|
|
ES6 Map performance for large numbers of elements is deficient
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2019-07-03
|
| 1162698
|
|
Thumbnail generation should have a time limit
|
Firefox
|
New Tab Page
|
nobody
|
NEW
|
---
|
2019-06-28
|
| 1167472
|
|
Make classes work in the JITs.
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2020-02-19
|
| 1184569
|
|
Firefox janks hard when loading a Google Docs presentation
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-11-24
|
| 1213513
|
|
2D canvas+HTML/CSS animation demo site broken on Firefox, works great on Chrome
|
Core
|
DOM: Animation
|
nobody
|
NEW
|
---
|
2019-04-16
|
| 1217748
|
|
On/Off opacity changes shouldn't create active layers
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1236104
|
|
Allow scripts from pre-load cache to be off-thread compiled.
|
Core
|
JavaScript Engine
|
nobody
|
REOP
|
---
|
2021-03-29
|
| 1242861
|
|
Google Inbox slow and cpu intensive
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-04-17
|
| 1246410
|
|
Low performance of texImage2D with canvas2d and WebGL
|
Core
|
Canvas: WebGL
|
nobody
|
NEW
|
---
|
2019-06-04
|
| 1253394
|
|
jquery performance increases if the page is displayed in a iframe
|
Core
|
Layout
|
nobody
|
UNCO
|
---
|
2021-03-15
|
| 1261484
|
|
Optimize position:static <--> position:relative changes to avoid jank from massive frame reconstruction
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2019-12-27
|
| 1265980
|
|
Running jasmine is slower than Safari and Chrome
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-10-18
|
| 1266140
|
|
Object.keys 50% slower than for...in
|
Core
|
JavaScript Engine
|
nobody
|
UNCO
|
---
|
2018-08-23
|
| 1280802
|
|
Angular framework performance test spends 10% in nursery GC
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2018-11-15
|
| 1287027
|
|
[google suite][google docs] FirstPaint/FirstVisualChange much slower loading a 1 page (UTF-8) google doc
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-04-15
|
| 1287418
|
|
Noticeable delay in autocomplete popup display
|
Firefox
|
Address Bar
|
nobody
|
NEW
|
---
|
2019-12-18
|
| 1296161
|
|
Measure and solve sync reflow for studying gdoc performance.
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1303296
|
|
Implement Expected Queueing Time (EQT) for Telemetry/Profiler
|
Core
|
DOM: Events
|
nobody
|
NEW
|
---
|
2018-11-25
|
| 1307024
|
|
[Perf] [google docs] Firefox will get 3~9% faster when running gdoc test cases with chrome user agent
|
Core
|
General
|
nobody
|
NEW
|
---
|
2020-02-07
|
| 1307262
|
|
slow animations at https://coolstar.org/misc/mikurain/
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1316864
|
|
Google Apps extremely slow -- scrolling, updating text, etc -- unusable
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-03-05
|
| 1320534
|
|
[meta] Speed and performance of importing bookmarks from JSON or HTML files is awful
|
Firefox
|
Bookmarks & History
|
nobody
|
NEW
|
---
|
2019-07-01
|
| 1329486
|
|
Poor HTTPs performance. Firefox 50.1.0 windows vs Chrome. Speedtest
|
Core
|
Networking
|
nobody
|
UNCO
|
---
|
2020-06-07
|
| 1329900
|
|
GC takes a long time on the test case in bug 1269695
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2018-04-19
|
| 1329923
|
|
Emit profiler markers for discarding Ion code
|
Core
|
JavaScript Engine: J
|
nobody
|
REOP
|
---
|
2017-10-06
|
| 1330547
|
|
Firefox is slower than Chrome to open a single empty slide presentation in Google Slides
|
Core
|
General
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1334655
|
|
PCompositorBridge::Msg_WillClose can block the UI thread when closing a window
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2020-10-30
|
| 1338802
|
|
CrossCompartmentWrapper handling is slow on Google Spreadsheet
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-04-12
|
| 1341716
|
|
Walking the stack incorrectly in the profiler makes us show a call to Preferences::GetBool from Exception::Initialize
|
Core
|
Gecko Profiler
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1341882
|
|
Slow performance at drawing rectangles on Google Slides
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-08-22
|
| 1341900
|
|
WriteStructuredClone can be slow on Google Drive
|
Core
|
JavaScript Engine
|
nobody
|
REOP
|
---
|
2018-09-24
|
| 1341913
|
|
Stop looking up GLContext symbols for every new window
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-04-23
|
| 1342632
|
|
Speed up PHttpChannelConstructor and consider streaming HttpChannelOpenArgs
|
Core
|
Networking: HTTP
|
nobody
|
NEW
|
---
|
2020-10-30
|
| 1343538
|
|
Overpainting on Google docs
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2019-01-10
|
| 1344377
|
|
Jank with unnecessary frame reconstruction & layout, when tweaking "position" on root of deeply-nested frame tree
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2018-01-23
|
| 1346178
|
|
Consider compiling Ion IC code less eagerly
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2021-03-17
|
| 1346335
|
|
Is "new" LinkedIn incompatible with "new" Firefox? (Gecko Profiler overhead)
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-06-21
|
| 1346365
|
|
Tab switching on GMail is slow due to texture allocation on Mac
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-06-21
|
| 1347666
|
|
Huff Post page load CPU usage much higher in Nightly vs 45 ESR
|
Core
|
General
|
nobody
|
NEW
|
---
|
2021-04-17
|
| 1347861
|
|
Consider storing hints during syntax parse
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-02-27
|
| 1349809
|
|
getElevationRequired janks the parent process by doing IO on the main thread
|
Toolkit
|
Application Update
|
nobody
|
NEW
|
---
|
2020-12-14
|
| 1350367
|
|
Make service worker ScriptLoader paths use cached js bytecode from cache API
|
Core
|
DOM: Service Workers
|
nobody
|
NEW
|
---
|
2018-11-05
|
| 1350618
|
|
Bad performance on Sony Horizon game page
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1350749
|
|
Add some instrumentation to find commonly added preference observers
|
Core
|
General
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1351789
|
|
Add Telemetry probes for measuring garbage volume per GC
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2018-03-07
|
| 1351829
|
|
Consider faster alternatives to PLDHashTable in hot Layout code paths
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2018-11-26
|
| 1351830
|
|
Consider adding StyleDisplay() values to nsIFrame
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2018-08-31
|
| 1352205
|
|
Avoid running the refresh driver when the page is in background
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2021-02-18
|
| 1353384
|
|
Optimize GetName TypeOfNoProperty
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-12-29
|
| 1354945
|
|
Initialize sandbox global properties lazily
|
Core
|
XPConnect
|
nobody
|
NEW
|
---
|
2018-11-05
|
| 1355456
|
|
Investigate preparing the next tab on mousedown on the tab close button
|
Firefox
|
Tabbed Browser
|
nobody
|
NEW
|
---
|
2019-03-09
|
| 1355466
|
|
Activating the browser window is janky
|
Core
|
Widget: Cocoa
|
nobody
|
NEW
|
---
|
2019-01-04
|
| 1356686
|
|
OMT brotli decompression
|
Core
|
Networking: HTTP
|
nobody
|
NEW
|
---
|
2021-05-03
|
| 1356765
|
|
6.9ms uninterruptible reflow at onxblpopupshowing@chrome://global/content/bindings/popup.xml:268:1
|
Toolkit
|
XUL Widgets
|
nobody
|
NEW
|
---
|
2020-12-14
|
| 1357481
|
|
1.03ms uninterruptible reflow at appendPrompt@chrome://browser/content/browser.js:8426:5
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2018-03-19
|
| 1357756
|
|
1.07ms uninterruptible reflow at open@resource://gre/modules/SelectParentHelper.jsm:109:24
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2019-10-11
|
| 1358390
|
|
1.24ms uninterruptible reflow at useLandscapeMode@chrome://devtools/content/inspector/inspector.js:460:27
|
DevTools
|
Inspector
|
nobody
|
NEW
|
---
|
2018-06-13
|
| 1358405
|
|
13.97ms uninterruptible reflow at getComputedURL@chrome://browser/content/nsContextMenu.js:979:15
|
Firefox
|
Menus
|
nobody
|
NEW
|
---
|
2018-03-19
|
| 1358724
|
|
1.15ms uninterruptible reflow at updateOverflowStatus@chrome://browser/content/places/browserPlacesViews.js:1163:1
|
Firefox
|
Bookmarks & History
|
nobody
|
NEW
|
---
|
2018-03-26
|
| 1358729
|
|
1.75ms uninterruptible reflow at onResize@chrome://devtools/content/sourceeditor/codemirror/codemirror.bundle.js:3783:1
|
DevTools
|
Source Editor
|
nobody
|
NEW
|
---
|
2018-06-13
|
| 1358730
|
|
2.41ms uninterruptible reflow at stop@chrome://global/content/bindings/browser.xml:99:13
|
Firefox
|
Tabbed Browser
|
nobody
|
NEW
|
---
|
2018-03-19
|
| 1358734
|
|
0.93ms uninterruptible reflow at showNavToolbox@chrome://browser/content/browser-fullScreenAndPointerLock.js:576:18
|
Firefox
|
Toolbars and Customi
|
nobody
|
NEW
|
---
|
2019-10-11
|
| 1358810
|
|
0.91ms uninterruptible reflow at create@resource://gre/modules/commonjs/toolkit/loader.js -> resource://devtools/client/framework/toolbox-hosts.js:86:5
|
DevTools
|
General
|
nobody
|
NEW
|
---
|
2018-06-13
|
| 1358829
|
|
0.99ms uninterruptible reflow at loadViewInternal@chrome://mozapps/content/extensions/extensions.js:932:5
|
Toolkit
|
Add-ons Manager
|
nobody
|
REOP
|
---
|
2019-01-22
|
| 1358927
|
|
Initializing gfxPlatform to get telemetry data is quite slow
|
Core
|
Graphics
|
nobody
|
REOP
|
---
|
2018-03-20
|
| 1359259
|
|
0.92ms uninterruptible reflow at PopupNotifications_showPanel@resource://gre/modules/PopupNotifications.jsm:932:9
|
Toolkit
|
Notifications and Al
|
nobody
|
NEW
|
---
|
2019-10-11
|
| 1359263
|
|
2.17ms uninterruptible reflow at receiveMessage@resource://gre/modules/SelectParentHelper.jsm:214:7
|
Core
|
Layout: Form Control
|
nobody
|
NEW
|
---
|
2019-10-11
|
| 1359296
|
|
Terrible scrolling on Mega page, profile attached (Possibly NSFW)
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1359408
|
|
0.29ms uninterruptible reflow at _handleDOMChange@chrome://extensions/content/ext-browser-content.js:215:24
|
WebExtensions
|
Frontend
|
nobody
|
NEW
|
---
|
2019-12-19
|
| 1360028
|
|
0.99ms uninterruptible reflow at showNotification@chrome://browser/content/browser-addons.js:412:22
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2018-03-05
|
| 1361115
|
|
1.42ms uninterruptible reflow (sync layout flush) at onResize in tabprompts.jsm
|
Firefox
|
Tabbed Browser
|
nobody
|
NEW
|
---
|
2019-04-08
|
| 1361635
|
|
1.19ms uninterruptible reflow from window.innerWidth at getContentSize@resource://gre/modules/PageThumbUtils.jsm:112:9
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2019-10-11
|
| 1362533
|
|
1.0ms uninterruptible reflow at PT__onDragOver@chrome://browser/content/places/browserPlacesViews.js:1600:11
|
Firefox
|
Bookmarks & History
|
nobody
|
NEW
|
---
|
2018-03-26
|
| 1363354
|
|
YouTube first video play is slow
|
Core
|
General
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1363383
|
|
Channel switching on Slack is slow
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-04-26
|
| 1363399
|
|
Amazon back start: page navigation using back button is slow (dupe?)
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1363403
|
|
Facebook profile navigation start: access the user photo profile from a post
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-08-28
|
| 1363586
|
|
[meta] Creating the XPCOM system info service is super expensive
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2020-04-02
|
| 1364091
|
|
Defer mozilla::widget::AudioSession::Start() until later in startup
|
Core
|
Widget: Win32
|
nobody
|
NEW
|
---
|
2020-08-08
|
| 1364290
|
|
1.89ms uninterruptible reflow at insertPlaceholder@resource://app/modules/DragPositionManager.jsm:181:7
|
Firefox
|
Toolbars and Customi
|
nobody
|
NEW
|
---
|
2018-03-20
|
| 1364324
|
|
0.98ms uninterruptible reflow at AreaPositionManager@resource://app/modules/DragPositionManager.jsm:24:23
|
Firefox
|
Toolbars and Customi
|
nobody
|
NEW
|
---
|
2018-03-19
|
| 1364861
|
|
Setting innerHTML slower than in Safari
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2019-03-13
|
| 1365305
|
|
0.86ms uninterruptible reflow at _positionPinnedTabs@chrome://browser/content/tabbrowser.xml:6147:33
|
Firefox
|
Tabbed Browser
|
nobody
|
NEW
|
---
|
2018-08-17
|
| 1365823
|
|
tab switching to gmail with theme is very slow on mac
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2017-11-27
|
| 1367352
|
|
[Input Latency] Firefox is 63% (35 ms) slower than Chrome in case Facebook - click right arrow on photo viewer
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-01-16
|
| 1367878
|
|
RegExp handling shows up in Facebook profile
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2017-12-06
|
| 1368761
|
|
Investigate sweeping atoms table concurrently
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2020-01-02
|
| 1370181
|
|
Don't start possibly-long-running GC work when there's not much time left in the budget
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2021-04-27
|
| 1370516
|
|
NSS should be initialized off main thread
|
Core
|
Security: PSM
|
nobody
|
NEW
|
---
|
2021-03-19
|
| 1371659
|
|
Google Search profile
|
Core
|
JavaScript Engine
|
nobody
|
REOP
|
---
|
2018-01-24
|
| 1371661
|
|
Google image search profile
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2018-01-24
|
| 1373394
|
|
[e10s] CSS transition of "margin-left" property is not smooth
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2017-11-21
|
| 1373694
|
|
Don't block on beforeunload events from third-party tracking domain scripts
|
Core
|
DOM: Events
|
nobody
|
NEW
|
---
|
2017-10-13
|
| 1373723
|
|
Speedometer async benchmarks performance is very flaky
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2020-04-18
|
| 1373773
|
|
PCompositorBridge::Msg_NotifyChildCreated sync IPC when opening tabs
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2020-12-28
|
| 1374011
|
|
substring shows up in Preact profiles
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1374354
|
|
SessionRestore slows down page loading of a new tab
|
Firefox
|
Session Restore
|
nobody
|
NEW
|
---
|
2019-11-28
|
| 1374382
|
|
Consider to process DOMLinkAdded event using animation frame callback + setTimeout(, 0)
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1374934
|
|
Could js::NativeGetProperty be faster?
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-10-04
|
| 1375022
|
|
Consider removing the Msg_GetClipboard sync IPC
|
Core
|
DOM: Copy & Paste an
|
nobody
|
NEW
|
---
|
2021-04-17
|
| 1375218
|
|
Slow painting on israelnationalnews.com
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1375565
|
|
GC: Do nursery allocation for external strings
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2019-01-31
|
| 1376698
|
|
speedometer v2 VueJS async subtests take about twice as long in Firefox vs. Chrome (mostly running JS)
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-07-23
|
| 1376861
|
|
Tune nursery parameters for the speedometer benchmark
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2019-07-23
|
| 1376948
|
|
Make "string" + array faster
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-04-12
|
| 1377316
|
|
mozilla::DisplayItemData::AssertDisplayItemData is slow
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2018-01-09
|
| 1377339
|
|
obj_toString() called from isDate() in Angular could be faster
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-04-12
|
| 1377710
|
|
Compiling lots of unused branches can be expensive
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-01-04
|
| 1378192
|
|
Loading re:Dash dashboards janks other content processes
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1379275
|
|
Selectboxes/dropdowns in servicenow are laggy/difficult to use when dom.forms.select.customstyling is enabled
|
Core
|
Layout: Form Control
|
nobody
|
NEW
|
---
|
2019-11-03
|
| 1379286
|
|
Use a kernel driver for profiling on Windows
|
Core
|
Gecko Profiler
|
nobody
|
NEW
|
---
|
2019-12-17
|
| 1380061
|
|
Could NodeListBinding::DOMProxyHandler::get() be optimized?
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2021-04-29
|
| 1380773
|
|
Consider adding large tenured promotion counts to MinorGC marker
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2019-01-31
|
| 1381384
|
|
Performance analysis on gmail_ail_compose_new_mail_via_keyboard
|
Core
|
General
|
nobody
|
NEW
|
---
|
2018-10-01
|
| 1381387
|
|
Performance analysis on gmail_ail_reply_mail
|
Core
|
JavaScript Engine
|
nobody
|
REOP
|
---
|
2018-10-01
|
| 1381857
|
|
Long (multi-second) pauses in Mac GL code waiting on mutexes when loading bankofamerica.com
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1382319
|
|
ABP causes us to spend 5x more time in selector matching on obama wikipedia page
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2018-01-23
|
| 1383364
|
|
for..of significantly slower in certain testcases
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2021-02-06
|
| 1383444
|
|
3.01ms uninterruptible reflow at nextStep@chrome://global/content/bindings/progressmeter.xml:83:19
|
Toolkit
|
XUL Widgets
|
nobody
|
NEW
|
---
|
2018-03-20
|
| 1383538
|
|
lightningmaps.org very slow, makes the content process unresponsive
|
Core
|
JavaScript Engine
|
nobody
|
UNCO
|
---
|
2017-10-06
|
| 1384008
|
|
Consider lowering heap thresholds
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1384562
|
|
Optimize the obj_toString call in OrdinaryToPrimitive
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-04-12
|
| 1384727
|
|
Make QueryInterface use integer IDs
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2018-10-06
|
| 1384900
|
|
Array.prototype.sort is slow on very sparse arrays
|
Core
|
JavaScript: Standard
|
nobody
|
NEW
|
---
|
2019-11-07
|
| 1384970
|
|
djvu-html5 demo spends lots of time in cross compartment wrapper overhead
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2017-10-10
|
| 1386104
|
|
400ms onload jank in this React testcase (Chrome: 120ms)
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2017-12-07
|
| 1388034
|
|
Avoid extra string copies in RegExpGlobalReplaceOpt by returning the input string when no match was found
|
Core
|
JavaScript: Standard
|
nobody
|
NEW
|
---
|
2017-10-06
|
| 1388179
|
|
Excessive time spent in layout/style when clicking rightarrow on Facebook photo viewer
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2021-04-17
|
| 1388263
|
|
Suspend the taskbar refresh in WindowsJumpLists.jsm when computer becomes idle
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2017-11-21
|
| 1388538
|
|
Add ICs for slotful own-prop Xray property access (property on the expando)
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1390232
|
|
Wrapping typed array in object has performance impact
|
Core
|
JavaScript Engine
|
nobody
|
UNCO
|
---
|
2017-12-07
|
| 1390928
|
|
sendStyleSheetInfo() shows up in profiles during page show
|
Firefox
|
Menus
|
nobody
|
NEW
|
---
|
2021-04-22
|
| 1391710
|
|
Nightly still has 2.2 times poorer JS perfomance than Chrome on Mozilla Log Analyzer
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-05-28
|
| 1393712
|
|
for-await-of with Async Generator is slow
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-04-24
|
| 1393977
|
|
Compiling the same script again and again for each embedded YouTube video
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-11-01
|
| 1395066
|
|
Breaking tab data collection into chunks
|
Firefox
|
Session Restore
|
nobody
|
NEW
|
---
|
2020-04-12
|
| 1395274
|
|
Scripted modification of the selection can jank the browser
|
Core
|
DOM: Selection
|
nobody
|
NEW
|
---
|
2018-03-25
|
| 1395813
|
|
Investigate whether we can remove the browser-element-api:call JS sync IPC
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2019-05-22
|
| 1397450
|
|
Eliminate or at least lessen main thread IO in UpdateService.jsm
|
Toolkit
|
Application Update
|
nobody
|
NEW
|
---
|
2020-11-06
|
| 1400787
|
|
Using software video decoders (include VP9) ramps up computer fans on Macbook.
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2020-07-31
|
| 1401345
|
|
Loading HR4909 (Defense Authorization Act) takes a very long time and causes content process to hang
|
Core
|
XSLT
|
nobody
|
NEW
|
---
|
2017-11-21
|
| 1403823
|
|
High CPU on twitch TV stream
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2021-04-19
|
| 1404950
|
|
new Promise(resolve => {}) is a performance footgun
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-05-01
|
| 1405281
|
|
Keystrokes trigger full-page (and slow) paint with contenteditable cells with borders or border-collapse
|
Core
|
Layout: Tables
|
nobody
|
NEW
|
---
|
2020-05-09
|
| 1413763
|
|
Hidden arrow panels keep trying to composite at 60fps
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2021-02-18
|
| 1413796
|
|
High CPU use on sbnation.com article page
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-12-13
|
| 1413810
|
|
Performance is poor on Ebay.ca Watch List
|
Core
|
Layout
|
nobody
|
UNCO
|
---
|
2018-02-05
|
| 1414284
|
|
Marmalead search page causes lots of slow graphics computation
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-01-24
|
| 1414938
|
|
Spike in memory use when navigating away from a page that uses a lot of memory
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2018-10-28
|
| 1417221
|
|
Prevent background thumbnails from causing high CPU usage
|
Toolkit
|
General
|
nobody
|
NEW
|
---
|
2019-01-23
|
| 1419053
|
|
[meta] Firefox's disk write behaviour is worse than other browsers' in some situations
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2021-03-15
|
| 1420440
|
|
Optimize the Function constructor
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-06-26
|
| 1423324
|
|
Add support for promoting parts of the WebRender scene to native layers
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2020-07-12
|
| 1424057
|
|
Excessive time spent running JS (in "transitionHandler" function), when clicking rightarrow on Facebook photo viewer
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2021-04-17
|
| 1424740
|
|
console.log of an object graph in a worker is very slow
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2019-03-13
|
| 1425040
|
|
Firefox is very slow entering/leaving Twitter “lightbox” effects when the DOM is large
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2020-12-25
|
| 1425106
|
|
Jupyter Lab very slow in Firefox, with rapid long flex reflows (triggered from JS .offsetTop calls)
|
Core
|
Layout: Flexbox
|
nobody
|
NEW
|
---
|
2020-04-27
|
| 1425389
|
|
Low javascript performance on Firefox Quantum
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2019-07-24
|
| 1426447
|
|
Avoid refresh driver ticks in windows that aren't ready for first paint yet
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2021-02-20
|
| 1427417
|
|
Mouse hover on https://kangax.github.io/compat-table/esnext/ is atrociously slow
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-01-16
|
| 1427607
|
|
severe jank when deleting sites from the history sidebar
|
Toolkit
|
Places
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1427739
|
|
Map/Reduce slow compared in Firefox Nightly vs Chrome
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-01-05
|
| 1428972
|
|
RexBench is slower than Chrome/WebKit
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-10-30
|
| 1434978
|
|
css blur is slow on EventBrite
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-03-04
|
| 1437914
|
|
Typing 25-30 chars on an input with expensive regexp pattern causes browser to hang
|
Core
|
DOM: Editor
|
nobody
|
NEW
|
---
|
2019-06-16
|
| 1438989
|
|
Long-running NotifyIconObservers::Run on main-thread in parent process when closing a tab
|
Toolkit
|
Places
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1439412
|
|
Linux: Evaluate only using fontconfig in the parent process
|
Core
|
Graphics: Text
|
nobody
|
NEW
|
---
|
2020-06-07
|
| 1441918
|
|
Antimalware Service Executable (Windows Defender) very active / high CPU when using Firefox
|
External Software Af
|
Other
|
nobody
|
NEW
|
---
|
2021-01-02
|
| 1443066
|
|
Try to understand why we're slower than Chrome on StyleBench "Positional pseudo classes : Adding leaf elements: Async" (& similar "Removing" measurement)
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2020-04-25
|
| 1448130
|
|
Overpainting (full-area paint flashing) in browser UI (toolbars, devtools, sidebars) when resizing window
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1451093
|
|
clearRect appears to be much slower now
|
Core
|
Canvas: 2D
|
nobody
|
NEW
|
---
|
2019-11-07
|
| 1451517
|
|
Really high CPU and memory usage on zerohedge.com due to ads
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-02-05
|
| 1453142
|
|
Testcase where we're not optimizing DOM things in top-level script with global scope assignment.
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1453351
|
|
[Form Autofill] Parsing Roll20 character sheet for phone numbers leads to janks
|
Toolkit
|
Form Autofill
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1454414
|
|
slow rasterizing on http://themaninblue.com/experiment/eclipse/
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-01-17
|
| 1454586
|
|
Optimize resume point creation in IonBuilder
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-06-21
|
| 1455118
|
|
Scrolling is a bit janky in card mode at reddit (post-redesign), with long waits mid-refresh-driver-tick between "reflow" & "display list"
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1456040
|
|
CPU usage spikes, delays on 2017 13-inch MacBook Pro when rendering
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2019-03-07
|
| 1456137
|
|
JIT code seems to spend a lot of time checking to see whether objects have getters or setters
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2018-05-03
|
| 1456241
|
|
dropbox shared image link page is very slow to close
|
Firefox
|
Tabbed Browser
|
nobody
|
NEW
|
---
|
2018-12-11
|
| 1456581
|
|
Gmail Sent folder locks up browser for minutes
|
Core
|
Layout: Text and Fon
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1456638
|
|
Checkerboarding while scrollbar-dragging due to slow display list build on specific page with table layout
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2019-05-29
|
| 1456964
|
|
It takes a long time to re-layout the plaintext page when the sidebar is opening or closing until move the mouse in the content area (with long time spent in RFindLineContaining)
|
Core
|
Layout: Block and In
|
nobody
|
NEW
|
---
|
2019-07-17
|
| 1458894
|
|
Window title in the taskbar changes multiple times when restoring session
|
Firefox
|
Session Restore
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1460264
|
|
Slow CSS animation in the header of paypal.com
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1462373
|
|
1.39ms uninterruptible reflow at _calculateMaxHeight@resource:///modules/PanelMultiView.jsm:1032:9
|
Firefox
|
Menus
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1462843
|
|
Firefox is twice as slow as Google Chrome running es-membrane tests
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-10-18
|
| 1465205
|
|
Nested grid/flex layout is slow in mobile UI at http://www.wikia.com/fandom
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2019-03-25
|
| 1466704
|
|
trying to View Source on twitter.com stalls out entire content process (spending lots of time in nsBidiPresUtils::TraverseFrames->nsBidiPresUtils::ResolveParagraph->SplitInlineAncestors)
|
Core
|
Layout: Text and Fon
|
nobody
|
NEW
|
---
|
2020-05-09
|
| 1466922
|
|
Styling jank (134ms style flush) when loading new Reddit layout
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1468246
|
|
High variability in performance testing with large images
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1468476
|
|
F5 causes content re-validation and this is slow
|
Core
|
DOM: Navigation
|
nobody
|
NEW
|
---
|
2021-04-26
|
| 1469383
|
|
Duplicate stub attachment for GetProp in browser tests
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1469947
|
|
Infinite painting on https://material.io/design/ (background image has animated SVG, but covered up by other stuff)
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1471029
|
|
High cpu/gpu usage and hangs on page-http://telegra.ph/Telegram-X-03-26 & other pages
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2019-11-07
|
| 1472941
|
|
Slow loads and performance at dvhn.nl, compared to Chrome
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2020-05-07
|
| 1475020
|
|
Slow reflows at cnn.com slideshow, with lots of time spent in nested grid reflow
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2019-09-11
|
| 1476241
|
|
GMail UI is slow, check mails or scrolling usually happens after a delay in seconds
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2019-12-02
|
| 1476398
|
|
Performance issues on HP site
|
Core
|
DOM: CSS Object Mode
|
nobody
|
NEW
|
---
|
2019-01-14
|
| 1476748
|
|
Reduce duplication and unify responsibility for window sizing
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2018-11-01
|
| 1476857
|
|
2048game.com has worse performance in Firefox as compared to Chrome browser
|
Firefox
|
General
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1478953
|
|
style.foo = bar changes are slow
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2021-04-17
|
| 1479083
|
|
URL bar seems to trigger multiple layouts when browser window is resized at certain sizes
|
Firefox
|
Toolbars and Customi
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1480477
|
|
Removing DOM children where positional pseudo-classes are involved is really slow.
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2020-07-14
|
| 1481124
|
|
Menu takes longer to open in Firefox than in chrome
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-02-07
|
| 1481783
|
|
React updates can trigger lots of GC activity
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2020-10-09
|
| 1481967
|
|
100% cpu usage and high memory use on page with multiple embedded videos
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1482264
|
|
Lots of paints during tab switch
|
Core
|
DOM: Content Process
|
nobody
|
NEW
|
---
|
2019-03-19
|
| 1483345
|
|
Try and re-attach NewObject stubs after GC
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-12-29
|
| 1486362
|
|
CPU usage is extremely high at githubuniverse.com
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2019-06-27
|
| 1487906
|
|
[meta] Network panel recording overhead
|
DevTools
|
Netmonitor
|
nobody
|
NEW
|
---
|
2019-11-26
|
| 1488435
|
|
Significant key input delay when typing on large Google Docs
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-05-21
|
| 1488780
|
|
decommit can be slow while holding the allocator lock
|
Core
|
Memory Allocator
|
nobody
|
NEW
|
---
|
2019-08-27
|
| 1489036
|
|
Make StringBuilder::ToString look for characters to escape in each text node and attribute value only once
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2019-03-13
|
| 1489253
|
|
Delete/open emails in Gmail is slower than Chrome
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-02-07
|
| 1490510
|
|
400ms browser jank after transition between normal and full-screen video
|
Core
|
DOM: Animation
|
nobody
|
NEW
|
---
|
2019-10-24
|
| 1490847
|
|
[meta] Long-standing Ion Compilation Time Issues
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2020-10-26
|
| 1490849
|
|
Off-Main-Thread Baseline Compilation
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2018-11-28
|
| 1490917
|
|
Gmail tab hangs when trying to forward and edit a long Ticketmaster email
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-11-07
|
| 1491111
|
|
Slow restyles when loading cnn.com in network panel
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1492611
|
|
Regexes are very slow typing in web.whatsapp.com with many images.
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1493218
|
|
GitHub PDF render is about 6x slower in Firefox compared to Chrome or Edge
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2021-05-17
|
| 1493603
|
|
External loads needlessly force creating an about:blank content viewer with confusing (wrong?) unload semantics
|
Core
|
DOM: Navigation
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1493643
|
|
window.open creates an initial about:blank window twice
|
Core
|
General
|
nobody
|
NEW
|
---
|
2018-10-31
|
| 1493751
|
|
Handle case when compositor receives layers but MozLayerTreeReady will not be serviced by the parent in time
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2018-11-13
|
| 1494363
|
|
High CPU usage on OSX with Google Docs
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-05-16
|
| 1494485
|
|
portainer.io - visible lag between blur in and out effect
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-12-13
|
| 1494623
|
|
www.google.com - Doodle stutters while playing when using Direct2D canvas
|
Core
|
Canvas: 2D
|
nobody
|
NEW
|
---
|
2018-12-08
|
| 1495213
|
|
Entering live view on Facebook is janky
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2018-12-13
|
| 1496514
|
|
Long stalls (10-15 seconds) while paging down on load of very large Google doc
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-04-18
|
| 1496554
|
|
MediaDecoder threads can contend on the allocator lock too much
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2020-04-18
|
| 1497626
|
|
Investigate if back/forward/reload from UI could interrupt JS
|
Core
|
DOM: Navigation
|
nobody
|
NEW
|
---
|
2018-10-29
|
| 1498459
|
|
Twitter spends a lot of time building display lists.
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2020-12-25
|
| 1498485
|
|
hubs.mozilla.com frame rate with an empty scene is too slow in FxR on Oculus Go
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-06-09
|
| 1501415
|
|
5+ second delay before first paint, when loading 27mb plaintext log file
|
Core
|
Layout: Text and Fon
|
nobody
|
NEW
|
---
|
2018-10-24
|
| 1503119
|
|
A lot of time spent in query_selector
|
Core
|
DOM: CSS Object Mode
|
nobody
|
NEW
|
---
|
2021-04-22
|
| 1503259
|
|
Animated page load throbber causes a permanent ~9% CPU load for Renderer threads of the main process
|
Core
|
Graphics: WebRender
|
nobody
|
REOP
|
---
|
2021-02-23
|
| 1503371
|
|
Large local files with many pictures load extremely slow
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2019-07-16
|
| 1503425
|
|
User reports lag such as when opening several new tabs
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2018-11-07
|
| 1503704
|
|
Very high CPU usage on fast.com
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2020-04-09
|
| 1503830
|
|
Firefox significantly impacted by high CPU load compared to other browsers / programs
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2019-11-17
|
| 1503919
|
|
Long restyle time during page load on raptor-tp6-amazon-firefox
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1504337
|
|
Consider if it makes sense to use HTTP1.1 on cellular connections
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2019-11-22
|
| 1505192
|
|
twitch.tv site loads slow compared to Chrome
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-05-01
|
| 1505483
|
|
Getting a list of audio devices on about:support is super slow sometimes
|
Core
|
Audio/Video
|
nobody
|
NEW
|
---
|
2019-06-01
|
| 1505533
|
|
graphics data gathering (and/or canvas webgl context initialization) from about:support is slow
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2018-11-16
|
| 1506331
|
|
High CPU utilization when rapidly hovering over tabs
|
Firefox
|
Tabbed Browser
|
nobody
|
NEW
|
---
|
2020-06-11
|
| 1506765
|
|
Do an optimization to not flush animations which are running on the compositor in various places where we call FlushPendingNotification
|
Core
|
DOM: Animation
|
nobody
|
NEW
|
---
|
2018-11-13
|
| 1509228
|
|
Optimizing nsGlobalWindowOuter::NotifyContentBlockingState() seems to have an impact on pageload
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2020-07-15
|
| 1510262
|
|
nsIncrementalDownload causes a lot of jank with main thread I/O while downloading updates in the background
|
Core
|
Networking: HTTP
|
nobody
|
NEW
|
---
|
2020-11-06
|
| 1512768
|
|
Pottermore hamburger menu slide-in animation is janky
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2020-02-24
|
| 1514113
|
|
Move ReprotectRegion and mprotect off the main thread
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2020-09-01
|
| 1515414
|
|
Defer GCs in background tabs/processes during pageload
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2021-04-27
|
| 1515473
|
|
CPU intensive slideshow on http://thesantaclausparade.com/
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-01-24
|
| 1515780
|
|
Consider more aggressively throttling deviceorientation events
|
Core
|
DOM: Device Interfac
|
nobody
|
NEW
|
---
|
2019-11-25
|
| 1517254
|
|
Slow load and long delay before search field can be interacted with on https://scouts.org.uk
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2019-02-11
|
| 1517509
|
|
Coalesce wheel events at the refresh driver level instead of at the IPC boundary
|
Core
|
DOM: UI Events & Foc
|
nobody
|
NEW
|
---
|
2021-04-23
|
| 1517534
|
|
Poor performance of simple "vector" operations on arrays
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-01-16
|
| 1517916
|
|
Skeletal Animation: Slow (FPS) on Firefox compare to Chrome
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-02-14
|
| 1518677
|
|
Avoid collection during page load
|
Core
|
JavaScript: GC
|
nobody
|
REOP
|
---
|
2019-11-24
|
| 1518857
|
|
provide optimized implementations of float modulus
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2021-02-26
|
| 1518995
|
|
Outstream.com page tilt effect is very laggy and jumpy with WebRender enabled
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2020-12-11
|
| 1519513
|
|
Can spend a really long time hanging the main thread in the parent process running gfxMacFontFamily::FindStyleVariations
|
Core
|
Layout: Text and Fon
|
nobody
|
NEW
|
---
|
2019-01-28
|
| 1520251
|
|
Slow performance for accessing objects in an array with 7+ elements
|
Core
|
JavaScript Engine: J
|
nobody
|
UNCO
|
---
|
2019-02-26
|
| 1520729
|
|
jetbrains "upsource" file-view hangs the browser, when scrolled
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2019-01-26
|
| 1520894
|
|
Low-latency video playback via MediaSource causes extremely high CPU/GPU usage and poor playback performance.
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2021-01-21
|
| 1520932
|
|
Spurious Choreographer vsync messages when running tests
|
GeckoView
|
General
|
nobody
|
NEW
|
---
|
2019-11-24
|
| 1522196
|
|
InitOtherFamilyNamesRunnable can slow down first page load and take > 100ms
|
Core
|
Layout: Text and Fon
|
nobody
|
NEW
|
---
|
2020-06-17
|
| 1522263
|
|
me.me - loading the site is slow in Desktop and freezes Fennec
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2019-01-24
|
| 1522311
|
|
On Android, scrolling m.imgur.com displays blank frames for long periods of time and shows images with a delay
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-04-18
|
| 1522612
|
|
9gag gets progressively slower to render as user scrolls down page (infinite scroll)
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2019-12-02
|
| 1523028
|
|
[meta] Performance of "about:config"
|
Toolkit
|
Preferences
|
nobody
|
NEW
|
---
|
2020-10-29
|
| 1524104
|
|
Consider lowering priority for offscreen iFrame processes
|
Core
|
DOM: Content Process
|
nobody
|
NEW
|
---
|
2021-03-19
|
| 1524334
|
|
Zooming in on Google Docs takes a long time
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-04-17
|
| 1524384
|
|
Twitch.tv video's (vod) freeze during playback on MacOS
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2019-03-05
|
| 1524880
|
|
https://takelessons.com/blog/best-guitar-songs-of-all-time-z01 is very slow to load on mobile
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-03-07
|
| 1525260
|
|
RSA Encrypt is VERY SLOW in firefox
|
Core
|
JavaScript Engine: J
|
nobody
|
UNCO
|
---
|
2019-03-21
|
| 1526487
|
|
[ARM64] Sometimes very laggy tab switching
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-02-21
|
| 1527037
|
|
Scroll jank when mousewheel-scrolling slide thumbnails on Google Docs (with lots of time spent painting & in GetFrameForPoint)
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2019-02-19
|
| 1527786
|
|
Incredibly bad intermittent typing lag on the new Twitter theme
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-11-15
|
| 1528285
|
|
[meta] Allow call of AsyncOpen and OnStart/OnStopRequest off the main thread
|
Core
|
Networking: HTTP
|
nobody
|
NEW
|
---
|
2021-04-08
|
| 1529276
|
|
resource:///modules/WindowsJumpLists.jsm still does main thread I/O
|
Firefox
|
Shell Integration
|
nobody
|
NEW
|
---
|
2020-11-06
|
| 1529283
|
|
nsAnonTempFileRemover::RemoveAnonTempFileFiles does main thread I/O off a timer
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2020-11-06
|
| 1529343
|
|
JavaScript algebra calculation on FireFox is slower than on Chrome
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2020-02-18
|
| 1531123
|
|
Upload speed is very slow in comparison to the expected. Works fine with both Chrome and Explorer.
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2020-04-05
|
| 1532115
|
|
[arm64-windows] Idle battery consumption on imgur is almost 2x higher than Edge
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2019-10-10
|
| 1532720
|
|
Speakerdeck expensive paints for switching slides
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-03-06
|
| 1532749
|
|
[Direct3D 11 (Advanced Layers)] Loading a website causes an insane spike in RAM (15GB) even with a clean profile, when it works fine on other browsers
|
Core
|
Graphics: Layers
|
nobody
|
NEW
|
---
|
2019-05-15
|
| 1535134
|
|
nsLayoutUtils::DisplayRootHasRetainedDisplayListBuilder is slow
|
Core
|
Web Painting
|
nobody
|
NEW
|
---
|
2019-03-20
|
| 1536622
|
|
[10.14.4] Poor battery life on MacBook Pro
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-06-27
|
| 1536739
|
|
Performance is slow/janky with a full complement of add-ons, restored session, opening discarded tabs
|
WebExtensions
|
General
|
nobody
|
NEW
|
---
|
2019-08-19
|
| 1537661
|
|
Slow response in Gmail
|
Core
|
JavaScript Engine
|
nobody
|
UNCO
|
---
|
2019-04-04
|
| 1538053
|
|
Schedule nursery GC and slices around requestAnimationFrame
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2021-04-27
|
| 1538784
|
|
Set nsThreadPool limits more intelligently
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2019-03-29
|
| 1539053
|
|
Rotating and/or moving text in creating a new story is very slow and choppy.
|
Core
|
Canvas: 2D
|
nobody
|
NEW
|
---
|
2020-08-28
|
| 1539266
|
|
Running gfxPlatform::Init in the content process can take a long time
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-03-29
|
| 1540026
|
|
RTX On/Off comparison on nvidia.com runs at a drastically lower FPS in Firefox than in Chrome
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2020-08-30
|
| 1540226
|
|
Brief video and audio interruptions on YouTube when tab is focused after it was in the background
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-05-15
|
| 1540917
|
|
With strict content-blocking, course pages at business.unsw.edu.au trigger a content-process hang (with error-handling recursion death-spiral, in site's JS)
|
Web Compatibility
|
Desktop
|
nobody
|
NEW
|
---
|
2021-01-29
|
| 1542995
|
|
Thousands of window.onload events creates high memory/CPU until it crashes
|
Core
|
General
|
nobody
|
NEW
|
---
|
2020-03-05
|
| 1543409
|
|
Wix editor is extremely slow in Firefox
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-07-24
|
| 1543776
|
|
[meta] 5+ second delays seen while loading www.allrecipes.com on geckoview_example
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-01-25
|
| 1544369
|
|
3.28 - 4.65% sessionrestore / startup_about_home_paint (linux64-shippable, windows10-64-shippable, windows10-64-shippable-qr) regression on push 6534d80a3329536b4bb9068f9d56ccb030616750 (Fri Apr 12 2019)
|
Firefox
|
Search
|
nobody
|
NEW
|
---
|
2019-12-11
|
| 1548539
|
|
Stopping blocking bfcache on unconnected peerconnections
|
Core
|
WebRTC
|
nobody
|
NEW
|
---
|
2019-05-08
|
| 1548824
|
|
2.21% tscrollx (windows10-64-shippable-qr) regression on push 09753a1a153d348d456a0c785fcffeb9a77dd065 (Wed May 1 2019)
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2019-11-15
|
| 1552003
|
|
Scrolling very laggy on good hardware since update a few weeks ago (current FF 66), profile attached
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2019-12-02
|
| 1552356
|
|
CSS Named Color "hue vs luminosity" chart demo is much slower in Firefox than in Chrome (with time spent in JS math code)
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2019-07-08
|
| 1553074
|
|
WebRender is using too much CPU (Radeon HD 6900? Lots of BG tabs?)
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2020-11-21
|
| 1553980
|
|
Defer initial processing by Privileged Content process at startup
|
Firefox
|
New Tab Page
|
nobody
|
NEW
|
---
|
2020-08-20
|
| 1554313
|
|
Classifier Update should wait for an user-idle period before initiating an update
|
Toolkit
|
Safe Browsing
|
nobody
|
NEW
|
---
|
2020-11-02
|
| 1554395
|
|
StartupCache takes a very long time to write out cache after browser startup
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2019-11-25
|
| 1555522
|
|
Enable JavaScript Startup Bytecode Cache for DevTools code
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-06-03
|
| 1556815
|
|
High CPU usage when browsing LinkedIn on Linux
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2019-07-16
|
| 1558170
|
|
Firefox freezes for 10 to 15 seconds every so often while working with Android Studio
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2019-09-25
|
| 1559438
|
|
Switching to "Tags" in Reply by Buffer hangs the process (slow querySelectorAll)
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2019-07-18
|
| 1567018
|
|
[DoS/Hang] Firefox still hangs on wake up from OS X Power Nap (even with AppNap disabled via 1551990)
|
Toolkit
|
Storage
|
nobody
|
NEW
|
---
|
2021-01-04
|
| 1567556
|
|
Slack "Add reaction" search popup flashes blue alt text before loading emoji images
|
Core
|
DOM: Service Workers
|
nobody
|
NEW
|
---
|
2020-08-04
|
| 1567626
|
|
enqueueSetState takes a lot longer time than Chrome on ARM devices
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-07-25
|
| 1567718
|
|
FF appears frozen while examining fonts on startup after OS update (due to DWrite caches being cold)
|
Core
|
Layout: Text and Fon
|
nobody
|
NEW
|
---
|
2020-10-21
|
| 1567863
|
|
Firefox startup slow - window loads quickly, but first network call delayed, works normal after that
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2021-05-01
|
| 1567977
|
|
Scrolling sometimes reacts late on touch input on Android
|
Core
|
Panning and Zooming
|
nobody
|
NEW
|
---
|
2021-02-10
|
| 1568027
|
|
WebRender performs worse on Binding of Isaac CodePen demo (svg filters/blob)
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2020-12-11
|
| 1569412
|
|
Firefox 68 on wife's MacBook Air 2015 macOS 10.14.5 is getting dreadfully slow and no way to find out why
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2019-09-27
|
| 1570417
|
|
Consider using line cursor for nsBlockFrame::AddFrames
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2019-08-01
|
| 1570750
|
|
gfxFontGroup::FindFontForChar took a lot of time during reflow
|
Core
|
Layout: Text and Fon
|
nobody
|
NEW
|
---
|
2021-04-22
|
| 1570770
|
|
Incremental reflows on New-tab page are showing up in profiler
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2019-08-01
|
| 1571238
|
|
Slow-ish style time with tons of custom elements and rules.
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2019-08-08
|
| 1571286
|
|
Firefox won't able to handle requests correctly this leads to slow down or crash the browsers
|
DevTools
|
Console
|
nobody
|
NEW
|
---
|
2020-07-02
|
| 1571800
|
|
Tons of time spent on the main thread when animations are accelerated in nsIFrame::IsScrolledOutOfView.
|
Core
|
CSS Transitions and
|
nobody
|
NEW
|
---
|
2019-08-21
|
| 1572180
|
|
68 runs 3x slower than 67 on sample script
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-08-06
|
| 1572538
|
|
Running ExtensionProcessScript.jsm during page load takes significant amount time
|
WebExtensions
|
General
|
nobody
|
NEW
|
---
|
2021-05-04
|
| 1572540
|
|
GV should disable logging by default in opt GV builds
|
GeckoView
|
General
|
nobody
|
NEW
|
---
|
2020-01-14
|
| 1573137
|
|
User reported extreme Android battery consumption - Firefox for Android 68.0
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-01-20
|
| 1576404
|
|
wizard of oz easter egg incredibly slow in Firefox
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-09-13
|
| 1578227
|
|
Loading arewefastyet.com can sometimes be very slow
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1578884
|
|
Opening menu is slow on salsitasoft.com on Firefox for Andoid, MacOS
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2020-10-22
|
| 1580656
|
|
Do not scan for new fonts so aggressively on Linux
|
Core
|
Graphics: Text
|
nobody
|
NEW
|
---
|
2020-01-24
|
| 1581296
|
|
Freeze / terrible performance with the attached test case
|
Core
|
Layout: Block and In
|
nobody
|
NEW
|
---
|
2019-09-17
|
| 1581978
|
|
High GPU on elements with multiple shadows
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2019-09-25
|
| 1582525
|
|
Avoid racing 6 connections for sites known to have been HTTP2 in the past
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2019-09-25
|
| 1583927
|
|
Firefox has 100% CPU usage.
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-12-10
|
| 1584418
|
|
High CPU usage on Firefox likely due to hidden loading spinners
|
Core
|
SVG
|
nobody
|
NEW
|
---
|
2021-04-07
|
| 1587040
|
|
VSync firing 255 times more frequently than normal during "display off" sleep on Windows
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-10-23
|
| 1588003
|
|
Text animation is slow
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-08-28
|
| 1589085
|
|
Protocol and MIME info handler service access in the child process causes synchronous IPC
|
Firefox
|
File Handling
|
nobody
|
NEW
|
---
|
2019-11-07
|
| 1591030
|
|
Images flash when returning to a tab
|
Core
|
ImageLib
|
nobody
|
NEW
|
---
|
2020-04-17
|
| 1592366
|
|
YouTube live streaming is janky and sometimes the image would freeze completely.
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2019-10-31
|
| 1593876
|
|
hanging + keyboard malfunction
|
Firefox
|
Session Restore
|
nobody
|
UNCO
|
---
|
2019-11-15
|
| 1596634
|
|
When blur filter is applied on a large area, it delays the full rendering
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-12-09
|
| 1597522
|
|
Gmail login page loading is slower than Chrome
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-04-30
|
| 1598356
|
|
Very long main-thread hangs when visiting YouTube in Nightly launched from DMG image - blocked launching the RDD process
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2021-03-24
|
| 1598384
|
|
13 seconds of jank when loading https://data.firefox.com/dashboard/hardware
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2019-12-05
|
| 1599216
|
|
Huge GUI lag when adjusting SVG
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-02-13
|
| 1599472
|
|
Stream the output of inflate in nsHTTPCompressConv::OnDataAvailable out to another thread to be converted to UTF16 when possible
|
Core
|
DOM: Networking
|
nobody
|
NEW
|
---
|
2019-11-28
|
| 1599489
|
|
For large json payloads, convert to UTF16 off the main thread
|
Core
|
DOM: Networking
|
nobody
|
NEW
|
---
|
2019-11-28
|
| 1602025
|
|
Browsing from about:blank to a URL runs activity-stream code and does an about:newtab reflow
|
Firefox
|
New Tab Page
|
nobody
|
NEW
|
---
|
2020-02-24
|
| 1602434
|
|
FileChannel::MakeFileInputStream does mainthread IO via nsIFile::IsDirectory
|
Core
|
Networking: File
|
nobody
|
NEW
|
---
|
2020-11-06
|
| 1602506
|
|
Visual metrics: Fenix is slower than Fennec for the site www.bing.com
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2019-12-16
|
| 1602508
|
|
Visual metrics: Fenix is slower than Fennec for the site www.youtube.com/watch?v=COU5T-Wafa4
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-03-02
|
| 1602510
|
|
Visual metrics: Fenix is slower than Fennec for the site https://stackoverflow.com/questions/927358/how-do-i-undo-the-most-recent-commits-in-git
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-02-28
|
| 1602513
|
|
Visual metrics: Fenix is slower than Fennec for the site booking.com
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-02-19
|
| 1602578
|
|
Certain sites use a large amount of memory, sometimes over 1 GB
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-02-26
|
| 1602842
|
|
OSXDisplay::EnableVsync hangs in CVDisplayLinkCreateWithActiveCGDisplays
|
Core
|
Widget: Cocoa
|
nobody
|
NEW
|
---
|
2021-02-20
|
| 1603302
|
|
Slow layout on longer WebSocket tables
|
DevTools
|
Netmonitor
|
nobody
|
NEW
|
---
|
2020-01-09
|
| 1603578
|
|
Implement caching of retired web-isolated processes for reuse in the same domain in Fission
|
Core
|
DOM: Navigation
|
nobody
|
NEW
|
---
|
Fri 18:35
|
| 1604077
|
|
Firefox Hangs Repeatedly Loading Some Sites
|
Core
|
DOM: Device Interfac
|
nobody
|
UNCO
|
---
|
2021-04-30
|
| 1604252
|
|
Visual metrics: Fenix is slower than Fennec for the site m.facebook.com
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-03-02
|
| 1604253
|
|
Visual metrics: Fenix is slower than Fennec for the site tripadvisor.com
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-02-19
|
| 1604255
|
|
Visual metrics: Fenix is slower than Fennec for the site abcnews.go.com
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2019-12-16
|
| 1604256
|
|
Visual metrics: Fenix is slower than Fennec for the site https://people.com/amp-stories/royal-a-to-z
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-02-19
|
| 1605513
|
|
Slashdot tab has consistently high energy impact (score of >19)
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-10-09
|
| 1607890
|
|
Slow paints in visbug
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2020-08-19
|
| 1608289
|
|
More GC's occurring during parsing in Fenix compared to Fennec 68
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2020-03-05
|
| 1608290
|
|
JS parsing (and possibly execution) slower in Fenix vs Fennec
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-06-08
|
| 1608826
|
|
[meta] Geckoview load initiation performance
|
GeckoView
|
General
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1609206
|
|
We need Performance testing builds for mozilla-central
|
Firefox Build System
|
General
|
nobody
|
NEW
|
---
|
2020-04-02
|
| 1609682
|
|
preload required content and master-process scripts at startup of GeckoView
|
GeckoView
|
General
|
nobody
|
NEW
|
---
|
2021-02-16
|
| 1612355
|
|
Render/Layout-Performance Issues with Grid-Layout
|
Core
|
Layout: Grid
|
nobody
|
NEW
|
---
|
2020-05-13
|
| 1613760
|
|
[fission-power] Synchronize periodic background tasks (such as expiration tracker ticks) across content processes
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-02-05
|
| 1613824
|
|
Apple Newsroom page takes a long time to load (30 seconds)
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-06-22
|
| 1614096
|
|
[meta] Move all devtools UI out of the parent process into a privileged content process
|
DevTools
|
General
|
nobody
|
NEW
|
---
|
2021-01-17
|
| 1614415
|
|
High CPU/janky performance when dragging on Tradingview charts
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-02-28
|
| 1614425
|
|
https://www.fido.ca/ Pages load on mobile is several seconds slower than chrome
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-02-28
|
| 1617497
|
|
animations on svg polygons perform better on Chrome than Firefox
|
Core
|
SVG
|
nobody
|
NEW
|
---
|
2021-04-07
|
| 1618391
|
|
Avoid parsing and compiling self-hosted code during startup (takes 90ms on Android Moto G5)
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-05-17
|
| 1619141
|
|
poll widget on tagesspiegel.de very laggy
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-03-13
|
| 1620079
|
|
Large amounts of time are spent in module import when starting Fenix (applink)
|
GeckoView
|
General
|
nobody
|
NEW
|
---
|
Thu 09:54
|
| 1620445
|
|
Share omni.ja memory between processes on Android
|
Toolkit
|
Startup and Profile
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1621021
|
|
Running Basemark Web 3.0 test in a background tb seems to bog down the compositor
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-05-11
|
| 1622455
|
|
Firefox tab freezes when a huge log is displayed on Github Actions
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-04-17
|
| 1622721
|
|
Slow performance when scrolling Firefox subreddit top posts of the week
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-01-10
|
| 1623408
|
|
Restoring Previous Session is sluggish
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-10-21
|
| 1623518
|
|
Script cache information from the content process is never written to disk in GeckoView (10-20ms startup penalty for uncached script loading)
|
GeckoView
|
General
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1626132
|
|
Ghost-Windows from reddit
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-07-08
|
| 1626263
|
|
High CPU load while waiting for a page to load (MacOS)
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2020-05-11
|
| 1626719
|
|
Firefox Nightly hangs when displaying a Grafana
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-04-08
|
| 1626789
|
|
Firefox becomes extremly unresponsive when doing local gecko build in parallel
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-01-25
|
| 1626816
|
|
WebRender program cache / shader initialization blocks the main thread via the sync IPC message PWebRenderBridge::EnsureConnected (25ms-40ms startup penalty)
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2020-05-11
|
| 1628220
|
|
Middle button actions slow when primary selection belongs to a remote process
|
Core
|
Widget: Gtk
|
nobody
|
UNCO
|
---
|
2020-11-05
|
| 1629649
|
|
Excessive memory usage on 32gb machine
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-03-27
|
| 1630442
|
|
Slow loading and closing of reddit posts on Moto G (XT1031)
|
Core
|
CSS Parsing and Comp
|
nobody
|
REOP
|
---
|
2021-03-17
|
| 1633318
|
|
"mozStorage #6" thread using 100% CPU
|
Toolkit
|
Places
|
nobody
|
NEW
|
---
|
2020-11-26
|
| 1637567
|
|
high CPU processor usage in firefox-v61
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-06-04
|
| 1637606
|
|
HTML Based Speed Tests Produce Slower Results or Fail
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2021-02-23
|
| 1637735
|
|
[Github] Very slow page loading on reddit (around 4x slower than Chromium)
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2021-03-30
|
| 1638058
|
|
Enable video in a Google Meet call makes Nightly stutter and hang.
|
Core
|
WebRTC
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1638119
|
|
Allow extension processes to be preallocated
|
Core
|
DOM: Navigation
|
nobody
|
NEW
|
---
|
2020-05-31
|
| 1639280
|
|
Unacceptable performance and memory consumption on Apart Posters VR experience.
|
Core
|
Canvas: WebGL
|
nobody
|
NEW
|
---
|
2020-10-05
|
| 1639740
|
|
Deselecting rows in gsheets takes 1s+ main thread plus severe delay
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-05-22
|
| 1640535
|
|
severe input lag when using multiple keyboards under linux(X11)
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-12-17
|
| 1641696
|
|
Firefox takes 50% more time than Microsoft Edge to display first paint of comments in reddit posts
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2021-05-04
|
| 1641724
|
|
Since updating Firefox Nightly after the Memorial Day weekend, browser is unstable and locks up
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-05-07
|
| 1642415
|
|
Memory leak and high CPU when opening prefs/options/settings or on startup, due to language packs matching build locales with older translations that lack some strings causing excessive locale loading
|
Core
|
Internationalization
|
nobody
|
NEW
|
---
|
2021-03-23
|
| 1642780
|
|
EasyEDA PCB designer extremely slow (skia vs. D2D difference in svg paths)
|
Core
|
Graphics
|
nobody
|
UNCO
|
---
|
2020-07-30
|
| 1642950
|
|
Opening browser console is very slow
|
DevTools
|
Console
|
nobody
|
NEW
|
---
|
2021-05-13
|
| 1643064
|
|
Memory leak in foreground webworker
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2020-07-14
|
| 1643226
|
|
[performance] Very high CPU usage and slow scrolling
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-01-09
|
| 1643560
|
|
High memory usage on Facebook
|
Core
|
JavaScript Engine
|
nobody
|
UNCO
|
---
|
2021-01-14
|
| 1646449
|
|
Background tabs stuck loading while CPU is under heavy load
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-07-09
|
| 1646496
|
|
Memory leak degradation
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-07-21
|
| 1647153
|
|
Slow reloading of Pocket Explore on Moto G (XT1031)
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-04-29
|
| 1647161
|
|
Make Win32 nsWindow cloaking-aware on Windows 8+
|
Core
|
Widget: Win32
|
nobody
|
NEW
|
---
|
2020-06-24
|
| 1647847
|
|
Huge lag typing into a slack popup
|
Core
|
JavaScript Engine
|
nobody
|
NEW
|
---
|
2020-06-25
|
| 1648233
|
|
High CPU usage by idle Firefox
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-06-30
|
| 1648793
|
|
Stuttering while scrolling on dual displays with game or video playing in one screen (Nvidia 2070, 2x 1440p@144hz)
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-07-07
|
| 1649890
|
|
High CPU use on Techradar
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-10-21
|
| 1650063
|
|
Loading https://www.worldometers.info/coronavirus/#countries is occasionally slow, takes lots of time in query_selector_slow
|
Core
|
CSS Parsing and Comp
|
nobody
|
NEW
|
---
|
2021-01-06
|
| 1650250
|
|
Slow startup/high CPU use when restoring Firefox session with about:newtab as active tab in all windows
|
Firefox
|
Session Restore
|
nobody
|
NEW
|
---
|
2021-01-21
|
| 1650288
|
|
lazy-loading images performances for small images
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-07-24
|
| 1650708
|
|
Firefox takes 50% more time than Chrome to load/reload pages on Boardgamegeek
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-07-24
|
| 1652048
|
|
Potentially unnecessary idle tasks queued for background processes via PerformanceCounters
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-02-12
|
| 1652793
|
|
Firefox gradually becomes slower to respond, until it becomes completely unresponsive
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-08-21
|
| 1653777
|
|
WebGL aquarium sample runs at 30 FPS on Google Pixel 2, 60 FPS on WebView/Chromium
|
Core
|
Canvas: WebGL
|
nobody
|
NEW
|
---
|
2021-02-16
|
| 1653809
|
|
Firefox taking up CPU (fans going crazy) on realsimple.com
|
Core
|
Layout
|
nobody
|
NEW
|
---
|
2021-02-01
|
| 1654087
|
|
reddit.com: slow page performance after scrolling through a lot of pages
|
Core
|
General
|
nobody
|
NEW
|
---
|
2021-04-30
|
| 1656386
|
|
Slow loading of Medium article on Moto G (XT1031)
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-07-31
|
| 1656709
|
|
some games at gamee.com stutter a lot on firefox while it's smooth on chrome
|
Core
|
Canvas: 2D
|
nobody
|
NEW
|
---
|
2020-10-26
|
| 1657183
|
|
Janking/stuttering while scrolling on imgur (Celeron N4000) (Geminilake)
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2021-01-27
|
| 1657651
|
|
Loading issue when first launching Firefox 79
|
Core
|
DOM: Service Workers
|
nobody
|
NEW
|
---
|
2020-11-17
|
| 1659286
|
|
Jank when closing tabs in a full tab bar from session restore
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-09-08
|
| 1659359
|
|
Heavy janking while doing page up/down on while loading a few tabs in the background
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-10-21
|
| 1659831
|
|
Geektyrant takes 4x as long as Chrome to load
|
Core
|
Layout: Grid
|
nobody
|
NEW
|
---
|
2020-08-28
|
| 1660475
|
|
slow websites on many tabs (3000+)
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2021-01-21
|
| 1661090
|
|
browser and content hangs when zooming map at https://mrosd.maps.arcgis.com/apps/webappviewer/index.html
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2020-10-05
|
| 1661491
|
|
Frame dropping due to GC when looking at https://arewefenixyet.com
|
Core
|
JavaScript: GC
|
nobody
|
NEW
|
---
|
2021-03-15
|
| 1661941
|
|
WebBrowserPersistSerialize actor does mainthread IO
|
Core
|
DOM: Core & HTML
|
nobody
|
NEW
|
---
|
2020-09-24
|
| 1662252
|
|
eightsleep.com is much slower (7-10s) to paint in Firefox than Chrome (1-3s)
|
Core
|
Audio/Video: Playbac
|
nobody
|
NEW
|
---
|
2020-09-07
|
| 1662811
|
|
Inconsistent & fluctuating FPS on webgl based sites
|
Core
|
Canvas: WebGL
|
nobody
|
UNCO
|
---
|
2021-01-08
|
| 1662825
|
|
Poor performance and call terminated during a Google Meet call
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
Tue 07:01
|
| 1663360
|
|
Choppy Animation of Pie and Line chart during page load
|
Core
|
JavaScript Engine
|
nobody
|
UNCO
|
---
|
2020-09-23
|
| 1664492
|
|
Extremely long DNS resolution times with Fenix
|
Core
|
Networking: DNS
|
nobody
|
NEW
|
---
|
2020-09-24
|
| 1665736
|
|
uBlock Origin slows down page loads on Galaxy m21
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-09-18
|
| 1665910
|
|
Firefox 80: Loading pages is often extremely slow
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-04-28
|
| 1666139
|
|
performance issues during startup
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-10-27
|
| 1667246
|
|
Fenix loads apple.com 2 seconds slower than Chrome
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-05-07
|
| 1667248
|
|
Fenix loads cloudflare.com 5 seconds slower than Chrome
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-10-02
|
| 1667250
|
|
Fenix loads adobe.com 4 seconds slower than Chrome
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-05-07
|
| 1669307
|
|
Investigate relaxing windows timer granularity, especially on battery, to reduce energy use
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2020-10-09
|
| 1670190
|
|
Increased redirectEnd metric in Firefox 80 when connecting to Jira
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-12-16
|
| 1671859
|
|
Not responding notification from Firefox (in titlebar) when switching to a background window
|
Core
|
Graphics
|
nobody
|
NEW
|
---
|
2021-02-02
|
| 1673988
|
|
Laggy Performance in bartamanpatrika.com in fenix
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-10-29
|
| 1675628
|
|
Checkerboarding on scrolling wired.com article
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-11-21
|
| 1676210
|
|
High memory and CPU usage on www.tvnow.de with garbage collector involved
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2020-12-11
|
| 1676799
|
|
Scrolling in firefox on Android, clicking a link has become slow; have to click a link twice or thrice to open
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2021-02-18
|
| 1676889
|
|
http requests to localhost ports where nothing is listening take longer to fail than in blink
|
Core
|
Networking
|
nobody
|
NEW
|
---
|
2021-01-28
|
| 1677569
|
|
CYCLE_COLLECTOR_MAX_PAUSE regression on May 11, 2020
|
Core
|
XPCOM
|
nobody
|
NEW
|
---
|
2021-04-21
|
| 1678512
|
|
Firefox slowing down to a crawl when using Whatsapp Web for several days
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2020-12-29
|
| 1678715
|
|
Very unresponsive content process, with a page using SMIL animations in the background
|
Core
|
SVG
|
nobody
|
NEW
|
---
|
2020-12-13
|
| 1679088
|
|
High CPU usage (WindowServer) on macOS Big Sur
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-05-14
|
| 1679309
|
|
More checkerboarding than Edge on politico.com, on a two core machine
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-12-19
|
| 1679770
|
|
Add improved telemetry for paint responsiveness
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-12-17
|
| 1680860
|
|
[meta] Performance investigations surrounding large IndexedDB responses
|
Core
|
Storage: IndexedDB
|
nobody
|
NEW
|
---
|
2021-05-04
|
| 1681088
|
|
Consider making speculative connections to minimize redirection time
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2020-12-17
|
| 1682163
|
|
Excessive memory use causing Firefox Quantum and other app crashes
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2021-03-23
|
| 1682986
|
|
Choppy Canvas2D on Android on this page
|
Core
|
Canvas: 2D
|
nobody
|
NEW
|
---
|
2021-01-29
|
| 1683250
|
|
Laggy swipes on swiperjs.com
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2021-02-16
|
| 1683300
|
|
[meta] High CPU load (40% - 100%) caused by the top extensions loading animation on https://code.visualstudio.com/docs/
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2021-02-22
|
| 1683354
|
|
[Bug] Scrolling stutter on gadgets.ndtv.com website
|
Core
|
Graphics: WebRender
|
nobody
|
NEW
|
---
|
2021-04-28
|
| 1683560
|
|
Huge performance regression in webgame on https://project-f.github.io
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-05-20
|
| 1685798
|
|
Focusing the summary text field on Bugzilla janks for one second
|
Toolkit
|
Form Autofill
|
nobody
|
NEW
|
---
|
2021-04-26
|
| 1685835
|
|
Too many tabs of one site can cause Firefox to lag
|
Core
|
Performance
|
nobody
|
NEW
|
---
|
2021-03-18
|
| 1686094
|
|
freezing on Facebook website with other tabs in the background
|
Core
|
Performance
|
nobody
|
UNCO
|
---
|
2021-02-18
|
| 1686592
|
|
Responsiveness: On Twitter, switching from Home to Explore takes 2.5x as long as in Chrome
|
Core
|
JavaScript Engine: J
|
nobody
|
NEW
|
---
|
2021-02-10
|