Closed Bug 1046384 Opened 10 years ago Closed 9 years ago

Minimizing Firefox window causes memory leak while watching html5 video

Categories

(Core :: Audio/Video: Playback, defect)

Product:
Core
Component:
Audio/Video: Playback
Version:
36 Branch
Platform:
x86_64
Windows 7
Type:
defect
Priority:
Not set
Severity:
normal

Tracking

()

Status:
RESOLVED WORKSFORME

People

(Reporter: sg4-neuss, Unassigned, NeedInfo)

Details

(Whiteboard: [MemShrink:P2]) 

User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0) Gecko/20100101 Firefox/34.0 (Beta/Release)
Build ID: 20140730030201

Steps to reproduce:

I am using Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140730030201 CSet: f61a27b00e05 on a win7
1. started youtube playlist https://www.youtube.com/watch?v=8DWVvOQ-y3M&list=PLxf55Dca1uXHUDC-lvkb_Ei8VRAgtQU-Y&index=102
2. minimized the window
3. (optional) maximize the window, and the memory usage resets


Actual results:

the moment i minimized the window the swap file and my ram started filling up to a point, where windows recommended me to close the firefox


Expected results:

the swapfile usage and the ram usage should have stayed the same
Hardware: x86 → x86_64
update:
now using Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140801030201 CSet: 104254bd1fc8 problem still persits
Whiteboard: [MemShrink]
how long do you have to wait ?

Does the bug happen with the latest Nightly?
Does the bug happen when running in Safe Mode?
Does the bug happen in competing browsers?
Does the bug happen on other Firefox versions?


cannot reproduce with  Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0) Gecko/20100101 Firefox/34.0 buildID	20140804030205
QA Whiteboard: [bugday-20140804]
Flags: needinfo?(sg4-neuss)
(In reply to Jan [:Jan\] from comment #2)
> how long do you have to wait ?
> 
> Does the bug happen with the latest Nightly?
> Does the bug happen when running in Safe Mode?
> Does the bug happen in competing browsers?
> Does the bug happen on other Firefox versions?
> 
> 
> cannot reproduce with  Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0)
> Gecko/20100101 Firefox/34.0 buildID	20140804030205

it seems to depend on how long the browser is running, but it should happen after about a minute

yes, it still happens with the latest build Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140804030205 CSet: e6614d8d85f9
no, the bug doesn't happen in safe mode
no, it doesn't seem to happen in IE11 (only non moz brower i have)
no, it does not happen in the latest stable build Mozilla/5.0 (Windows NT 6.1; WOW64; rv:27.0) Gecko/20100101 Firefox/27.0 ID:20140212131424 CSet: 0414e679f2ab

here are images of my extensions and plugins:
http://empirecraft.de/images/extension%20list.jpg
http://empirecraft.de/images/plugin%20list.jpg
Flags: needinfo?(sg4-neuss)
Info: you can get a text list of add-ons and other changed settings by clicking a button in about:support.
thanks Aleksej
here now the text version of about:support

Application Basics
------------------

Name: Firefox
Version: 34.0a1
User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0) Gecko/20100101 Firefox/34.0
Multiprocess Windows: 0/1

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports

Extensions
----------

Name: Adblock Plus
Version: 2.6.4
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: DownloadHelper
Version: 4.9.22
Enabled: true
ID: {b9db16a4-6edc-47ec-a1f4-b86292ed211d}

Name: Flagfox
Version: 5.0.5
Enabled: true
ID: {1018e4d6-728f-4b20-ad56-37578a4de76b}

Name: Greasemonkey
Version: 2.1
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: Live IP Address
Version: 1.83
Enabled: true
ID: {7C9AE782-DB21-4e40-81FB-AD8A53A6233A}

Name: Nightly Tester Tools
Version: 3.7
Enabled: true
ID: {8620c15f-30dc-4dba-a131-7c5d20cf4a29}

Name: Tab Counter
Version: 1.9.9
Enabled: true
ID: tabcounter@morac

Name: Test Pilot
Version: 1.2.3
Enabled: true
ID: testpilot@labs.mozilla.com

Name: WOT
Version: 20131118
Enabled: true
ID: {a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}

Name: DivX Web Player
Version: 2.0.2.039
Enabled: false
ID: DivXWebPlayer@divx.com

Name: FireShot
Version: 0.98.26
Enabled: false
ID: {0b457cAA-602d-484a-8fe7-c1d894a011ba}

Name: OkayFreedom
Version: 1.2.2
Enabled: false
ID: {DB981CCA-088E-4731-A4A2-2FE218703C0E}

Name: User Agent Switcher
Version: 0.7.3
Enabled: false
ID: {e968fc70-8f95-4ab9-9e79-304de2a71ee1}

Graphics
--------

Adapter Description: NVIDIA GeForce GTX 760
Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: 2048
Device ID: 0x1187
Direct2D Enabled: true
DirectWrite Enabled: true (6.2.9200.16492)
Driver Date: 7-2-2014
Driver Version: 9.18.13.4052
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Subsys ID: 11871569
Vendor ID: 0x10de
WebGL Renderer: Google Inc. -- ANGLE (NVIDIA GeForce GTX 760 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 2
browser.places.smartBookmarksVersion: 7
browser.sessionstore.max_tabs_undo: 15
browser.sessionstore.upgradeBackup.latestBuildID: 20140804030205
browser.startup.homepage: about:home
browser.startup.homepage_override.buildID: 20140804030205
browser.startup.homepage_override.mstone: 34.0a1
dom.mozApps.used: true
dom.w3c_touch_events.expose: false
extensions.lastAppVersion: 34.0a1
font.internaluseonly.changed: false
gfx.direct3d.checkDX10: true
gfx.direct3d.last_used_feature_level_idx: 0
gfx.direct3d.prefer_10_1: true
media.gmp-gmpopenh264.enabled: false
media.gmp-manager.lastCheck: 1407165487
network.cookie.prefsMigrated: true
network.http.pipelining: true
network.http.proxy.pipelining: true
places.database.lastMaintenance: 1407170405
places.history.expiration.transient_current_max_pages: 104858
places.history.expiration.transient_optimal_database_size: 167772160
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
print.printer_Microsoft_XPS_Document_Writer.print_bgcolor: false
print.printer_Microsoft_XPS_Document_Writer.print_bgimages: false
print.printer_Microsoft_XPS_Document_Writer.print_colorspace:
print.printer_Microsoft_XPS_Document_Writer.print_command:
print.printer_Microsoft_XPS_Document_Writer.print_downloadfonts: false
print.printer_Microsoft_XPS_Document_Writer.print_duplex: 1515870810
print.printer_Microsoft_XPS_Document_Writer.print_edge_bottom: 0
print.printer_Microsoft_XPS_Document_Writer.print_edge_left: 0
print.printer_Microsoft_XPS_Document_Writer.print_edge_right: 0
print.printer_Microsoft_XPS_Document_Writer.print_edge_top: 0
print.printer_Microsoft_XPS_Document_Writer.print_evenpages: true
print.printer_Microsoft_XPS_Document_Writer.print_footercenter:
print.printer_Microsoft_XPS_Document_Writer.print_footerleft: &PT
print.printer_Microsoft_XPS_Document_Writer.print_footerright: &D
print.printer_Microsoft_XPS_Document_Writer.print_headercenter:
print.printer_Microsoft_XPS_Document_Writer.print_headerleft: &T
print.printer_Microsoft_XPS_Document_Writer.print_headerright: &U
print.printer_Microsoft_XPS_Document_Writer.print_in_color: true
print.printer_Microsoft_XPS_Document_Writer.print_margin_bottom: 0.5
print.printer_Microsoft_XPS_Document_Writer.print_margin_left: 0.5
print.printer_Microsoft_XPS_Document_Writer.print_margin_right: 0.5
print.printer_Microsoft_XPS_Document_Writer.print_margin_top: 0.5
print.printer_Microsoft_XPS_Document_Writer.print_oddpages: true
print.printer_Microsoft_XPS_Document_Writer.print_orientation: 0
print.printer_Microsoft_XPS_Document_Writer.print_page_delay: 50
print.printer_Microsoft_XPS_Document_Writer.print_paper_data: 9
print.printer_Microsoft_XPS_Document_Writer.print_paper_height: 11,00
print.printer_Microsoft_XPS_Document_Writer.print_paper_name:
print.printer_Microsoft_XPS_Document_Writer.print_paper_size_type: 0
print.printer_Microsoft_XPS_Document_Writer.print_paper_size_unit: 1
print.printer_Microsoft_XPS_Document_Writer.print_paper_width: 8,50
print.printer_Microsoft_XPS_Document_Writer.print_plex_name:
print.printer_Microsoft_XPS_Document_Writer.print_resolution: 1515870810
print.printer_Microsoft_XPS_Document_Writer.print_resolution_name:
print.printer_Microsoft_XPS_Document_Writer.print_reversed: false
print.printer_Microsoft_XPS_Document_Writer.print_scaling: 1,00
print.printer_Microsoft_XPS_Document_Writer.print_shrink_to_fit: true
print.printer_Microsoft_XPS_Document_Writer.print_to_file: false
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_bottom: 0
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_left: 0
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_right: 0
print.printer_Microsoft_XPS_Document_Writer.print_unwriteable_margin_top: 0
privacy.donottrackheader.enabled: true
privacy.sanitize.migrateFx3Prefs: true
security.disable_button.openCertManager: false
security.disable_button.openDeviceManager: false
security.OCSP.disable_button.managecrl: false
security.warn_viewing_mixed: false
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1405001881

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.7 Beta
Version in use: 4.10.7 Beta

NSS
Expected minimum version: 3.17 Basic ECC Beta
Version in use: 3.17 Basic ECC Beta

NSSSMIME
Expected minimum version: 3.17 Basic ECC Beta
Version in use: 3.17 Basic ECC Beta

NSSSSL
Expected minimum version: 3.17 Basic ECC Beta
Version in use: 3.17 Basic ECC Beta

NSSUTIL
Expected minimum version: 3.17 Beta
Version in use: 3.17 Beta

Experimental Features
---------------------
Whiteboard: [MemShrink] → [MemShrink:P2]
Summary: minimize memory leak html5 video → Minimizing Firefox window causes memory leak while watching html5 video
This reminds me of bug 937878, though that was on Mac and so it may not be related. I also wonder if it's an OMTC thing.
Component: Untriaged → Video/Audio
Product: Firefox → Core
I'm not able to reproduce anything like the rapid memory usage mentioned in comment 0 with a clean profile.  I do see that after every 30 minutes or so of playing while minimized, memory usage has increased by ~50-75MB in both 32-bit and 64-bit builds of Firefox.

The only thing that stands out to me in about:memory is gpu-shared memory, around 500MB in both 32-bit and 64-bit.  heap-overhead is ~10-12%, which seems a little high.  Everything else looks pretty normal.

I can think of several next steps:

- Obtaining an about:memory report (I understand this is difficult if memory usage is increasing rapidly);
- Testing in safe mode on the reporter's machine, to eliminate any addons;
- Bisecting the addons to try and figure out which one might be at fault.

sg4-neuss, can you do at least the first two steps?
Flags: needinfo?(sg4-neuss)
As stated in comment 3 the bug doesn't happen in safe mode.

Another strange thing I just noticed is, the memory usage increase only shows on the Task Manager performance tab, because NO process shows any increase in memory usage (not even ff or the plugin container).

here an about:memory of just after taking the ff out of minimized state:

Main Process
Explicit Allocations

614.27 MB (100.0%) -- explicit
├──226.07 MB (36.80%) -- window-objects
│  ├───76.97 MB (12.53%) -- top(about:memory, id=486)
│  │   ├──76.03 MB (12.38%) -- active/window(about:memory)
│  │   │  ├──74.31 MB (12.10%) -- dom
│  │   │  │  ├──73.85 MB (12.02%) ── orphan-nodes
│  │   │  │  └───0.47 MB (00.08%) ++ (5 tiny)
│  │   │  └───1.72 MB (00.28%) ++ (4 tiny)
│  │   └───0.93 MB (00.15%) ++ js-zone(0x24818000)
│  ├───55.69 MB (09.07%) ++ (236 tiny)
│  ├───33.55 MB (05.46%) -- top(https://www.youtube.com/watch?v=L0LMkIKyQuA&list=PLxf55Dca1uXHUDC-lvkb_Ei8VRAgtQU-Y&index=99, id=344)
│  │   ├──28.34 MB (04.61%) -- active
│  │   │  ├──17.65 MB (02.87%) -- window(https://www.youtube.com/watch?v=L0LMkIKyQuA&list=PLxf55Dca1uXHUDC-lvkb_Ei8VRAgtQU-Y&index=99)
│  │   │  │  ├──10.59 MB (01.72%) ++ (5 tiny)
│  │   │  │  └───7.07 MB (01.15%) ++ layout
│  │   │  ├───9.70 MB (01.58%) ++ window(https://apis.google.com/u/0/wm/4/_/widget/render/comments?usegapi=1&first_party_property=YOUTUBE&href=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DL0LMkIKyQuA%26list%3DPLxf55Dca1uXHUDC-lvkb_Ei8VRAgtQU-Y%26index%3D99&owner_id=5I3vUh2iNfQ3pCU3sodYRA&query=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DL0LMkIKyQuA&stream_id=UC5I3vUh2iNfQ3pCU3sodYRA&substream_id=L0LMkIKyQuA&view_type=FILTERED&width=590&youtube_video_acl=PUBLIC&viewer_id=UCBhUiVl4EAmTENy_uK5nXtQ&hl=de_DE&origin=https%3A%2F%2Fwww.youtube.com&search=%3Fv%3DL0LMkIKyQuA%26list%3DPLxf55Dca1uXHUDC-lvkb_Ei8VRAgtQU-Y%26index%3D99&hash=&gsrc=1p&jsh=m%3B%2F_%2Fscs%2Fabc-static%2F_%2Fjs%2Fk%3Dgapi.gapi.en.2sP0CjtIlu8.O%2Fm%3D__features__%2Frt%3Dj%2Fd%3D1%2Frs%3DAItRSTPAl9CJYAU1Iw9xoBtn71D0VhQI4Q#_methods=onPlusOne%2C_ready%2C_close%2C_open%2C_resizeMe%2C_renderstart%2Concircled%2Cdrefresh%2Cerefresh%2Confirsttimeplusonepromo%2Conthumbsup%2Contimestampclicked%2Conready%2Conallcommentsclicked&id=I0_1407410593624&parent=https%3A%2F%2Fwww.youtube.com&pfname=&rpctoken=95234869)
│  │   │  └───0.98 MB (00.16%) ++ window(https://plus.google.com/_/notifications/frame?origin=https%3A%2F%2Fwww.youtube.com&source=yt&hl=de-DE&jsh=m%3B%2F_%2Fscs%2Fabc-static%2F_%2Fjs%2Fk%3Dgapi.gapi.en.2sP0CjtIlu8.O%2Fm%3D__features__%2Frt%3Dj%2Fd%3D1%2Frs%3DAItRSTPAl9CJYAU1Iw9xoBtn71D0VhQI4Q#pid=36&rpctoken=326338419&_methods=setNotificationWidgetSize%2CsetNotificationWidgetHeight%2CsetNotificationText%2ChideNotificationWidget%2CopenSharebox%2ConError%2C_ready%2C_close%2C_open%2C_resizeMe%2C_renderstart&id=I1_1407410592364&parent=https%3A%2F%2Fwww.youtube.com&pfname=)
│  │   └───5.21 MB (00.85%) ++ js-zone(0x20eeb800)
│  ├───31.19 MB (05.08%) -- top(https://www.youtube.com/watch?v=DKabFcMsFxw&list=PL8A6F8B8D9D800A8C&index=55, id=9)
│  │   ├──26.42 MB (04.30%) -- active
│  │   │  ├──16.80 MB (02.73%) -- window(https://www.youtube.com/watch?v=DKabFcMsFxw&list=PL8A6F8B8D9D800A8C&index=55)
│  │   │  │  ├──10.19 MB (01.66%) ++ (5 tiny)
│  │   │  │  └───6.61 MB (01.08%) ++ layout
│  │   │  ├───8.47 MB (01.38%) ++ window(https://apis.google.com/u/0/wm/4/_/widget/render/comments?usegapi=1&first_party_property=YOUTUBE&href=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DDKabFcMsFxw%26list%3DPL8A6F8B8D9D800A8C%26index%3D55&owner_id=C2DOjKQ18SVcnt2RERvwPA&query=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DDKabFcMsFxw&stream_id=UCC2DOjKQ18SVcnt2RERvwPA&substream_id=DKabFcMsFxw&view_type=FILTERED&width=590&youtube_video_acl=PUBLIC&viewer_id=UCBhUiVl4EAmTENy_uK5nXtQ&hl=de_DE&origin=https%3A%2F%2Fwww.youtube.com&search=%3Fv%3DDKabFcMsFxw%26list%3DPL8A6F8B8D9D800A8C%26index%3D55&hash=&gsrc=1p&jsh=m%3B%2F_%2Fscs%2Fabc-static%2F_%2Fjs%2Fk%3Dgapi.gapi.en.2sP0CjtIlu8.O%2Fm%3D__features__%2Frt%3Dj%2Fd%3D1%2Frs%3DAItRSTPAl9CJYAU1Iw9xoBtn71D0VhQI4Q#_methods=onPlusOne%2C_ready%2C_close%2C_open%2C_resizeMe%2C_renderstart%2Concircled%2Cdrefresh%2Cerefresh%2Confirsttimeplusonepromo%2Conthumbsup%2Contimestampclicked%2Conready%2Conallcommentsclicked&id=I0_1407410582615&parent=https%3A%2F%2Fwww.youtube.com&pfname=&rpctoken=13693886)
│  │   │  └───1.15 MB (00.19%) ++ (2 tiny)
│  │   └───4.77 MB (00.78%) ++ js-zone(0x163d3800)
│  ├───19.24 MB (03.13%) -- top(chrome://browser/content/browser.xul, id=3)
│  │   ├──10.14 MB (01.65%) -- active
│  │   │  ├───9.98 MB (01.62%) ++ window(chrome://browser/content/browser.xul)
│  │   │  └───0.16 MB (00.03%) ++ window(about:blank)
│  │   └───9.10 MB (01.48%) -- js-zone(0xd861800)
│  │       ├──8.59 MB (01.40%) ── unused-gc-things
│  │       └──0.51 MB (00.08%) ++ (4 tiny)
│  └────9.42 MB (01.53%) -- top(https://bugzilla.mozilla.org/show_bug.cgi?id=1046384, id=478)
│       ├──8.73 MB (01.42%) -- active
│       │  ├──8.33 MB (01.36%) ++ window(https://bugzilla.mozilla.org/show_bug.cgi?id=1046384)
│       │  └──0.40 MB (00.07%) ++ window(about:blank)
│       └──0.70 MB (00.11%) ++ js-zone(0x243ca800)
├──201.06 MB (32.73%) -- js-non-window
│  ├──137.67 MB (22.41%) -- zones
│  │  ├──128.20 MB (20.87%) -- zone(0x1f51000)
│  │  │  ├───55.47 MB (09.03%) -- compartment([System Principal], inProcessTabChildGlobal?ownedBy=chrome://browser/content/browser.xul)
│  │  │  │   ├──22.70 MB (03.70%) -- objects
│  │  │  │   │  ├──18.56 MB (03.02%) -- gc-heap
│  │  │  │   │  │  ├──15.77 MB (02.57%) ── function [239]
│  │  │  │   │  │  └───2.79 MB (00.45%) ── ordinary [238]
│  │  │  │   │  └───4.14 MB (00.67%) ++ (2 tiny)
│  │  │  │   ├──20.29 MB (03.30%) -- shapes
│  │  │  │   │  ├──14.69 MB (02.39%) -- gc-heap
│  │  │  │   │  │  ├──10.34 MB (01.68%) ── tree/global-parented [239]
│  │  │  │   │  │  └───4.35 MB (00.71%) ── base [239]
│  │  │  │   │  └───5.60 MB (00.91%) ── malloc-heap/compartment-tables [239]
│  │  │  │   ├───6.27 MB (01.02%) ++ sundries
│  │  │  │   └───6.21 MB (01.01%) ── scripts/gc-heap [237]
│  │  │  ├───38.36 MB (06.25%) ++ (248 tiny)
│  │  │  ├───24.02 MB (03.91%) ── unused-gc-things
│  │  │  └───10.35 MB (01.68%) -- strings
│  │  │      ├───9.27 MB (01.51%) ++ string(<non-notable strings>)
│  │  │      └───1.08 MB (00.18%) ++ (38 tiny)
│  │  ├────8.21 MB (01.34%) -- zone(0x1f48800)
│  │  │    ├──8.02 MB (01.31%) ++ strings/string(<non-notable strings>)
│  │  │    └──0.19 MB (00.03%) ++ (5 tiny)
│  │  └────1.26 MB (00.21%) ++ (5 tiny)
│  ├───33.46 MB (05.45%) -- runtime
│  │   ├──15.03 MB (02.45%) -- gc
│  │   │  ├──15.00 MB (02.44%) ── nursery-committed
│  │   │  └───0.03 MB (00.01%) ++ (3 tiny)
│  │   ├───8.10 MB (01.32%) ── atoms-table
│  │   ├───7.14 MB (01.16%) ── script-data
│  │   └───3.19 MB (00.52%) ++ (10 tiny)
│  └───29.93 MB (04.87%) -- gc-heap
│      ├──24.93 MB (04.06%) ── unused-arenas
│      └───5.00 MB (00.81%) ++ (2 tiny)
├───53.37 MB (08.69%) ── heap-unclassified
├───32.12 MB (05.23%) -- heap-overhead
│   ├──22.01 MB (03.58%) ── bin-unused
│   ├───6.34 MB (01.03%) ── bookkeeping
│   └───3.77 MB (00.61%) ++ (2 tiny)
├───31.61 MB (05.15%) -- add-ons
│   ├──24.46 MB (03.98%) -- {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}/js-non-window/zones/zone(0x1f51000)/compartment([System Principal], jar:file:///C:/Users/Marius/AppData/Roaming/Mozilla/Firefox/Profiles/9i9b2d31.default/extensions/%7Bd10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d%7D.xpi!/bootstrap.js (from: resource://gre/modules/addons/XPIProvider.jsm:4174))
│   │  ├──14.87 MB (02.42%) -- objects
│   │  │  ├───9.48 MB (01.54%) ++ gc-heap
│   │  │  └───5.39 MB (00.88%) ++ (2 tiny)
│   │  ├───9.38 MB (01.53%) -- shapes
│   │  │   ├──6.45 MB (01.05%) -- gc-heap
│   │  │   │  ├──6.15 MB (01.00%) ── dict
│   │  │   │  └──0.30 MB (00.05%) ++ (2 tiny)
│   │  │   └──2.92 MB (00.48%) ++ malloc-heap
│   │  └───0.21 MB (00.03%) ++ (3 tiny)
│   └───7.15 MB (01.16%) ++ (7 tiny)
├───26.96 MB (04.39%) ++ (17 tiny)
├───14.41 MB (02.35%) -- layout
│   ├──13.98 MB (02.28%) ── style-sheet-service
│   └───0.43 MB (00.07%) ── style-sheet-cache
├───11.05 MB (01.80%) -- storage
│   ├───8.39 MB (01.37%) ++ sqlite
│   └───2.66 MB (00.43%) ++ prefix-set
├────9.32 MB (01.52%) ++ xpconnect
└────8.29 MB (01.35%) -- images
     ├──7.71 MB (01.25%) ++ content/raster/used
     └──0.59 MB (00.10%) ++ chrome

Other Measurements

30.79 MB (100.0%) -- decommitted
├──27.74 MB (90.12%) -- js-non-window
│  ├──26.74 MB (86.87%) ── gc-heap/decommitted-arenas
│  └───1.00 MB (03.25%) ── runtime/gc/nursery-decommitted
└───3.04 MB (09.88%) -- workers/workers(chrome)
    ├──1.57 MB (05.09%) -- worker(resource:///modules/sessionstore/SessionWorker.js, 0x13f6d800)
    │  ├──1.57 MB (05.09%) ── gc-heap/decommitted-arenas
    │  └──0.00 MB (00.00%) ── runtime/gc/nursery-decommitted
    └──1.48 MB (04.80%) -- worker(resource://gre/modules/osfile/osfile_async_worker.js, 0xac56000)
       ├──1.48 MB (04.80%) ── gc-heap/decommitted-arenas
       └──0.00 MB (00.00%) ── runtime/gc/nursery-decommitted

5,298 (100.0%) -- event-counts
├──5,297 (99.98%) -- window-objects
│  ├──3,691 (69.67%) -- top(chrome://browser/content/browser.xul, id=3)/active/window(chrome://browser/content/browser.xul)/dom
│  │  ├──3,688 (69.61%) ── event-listeners
│  │  └──────3 (00.06%) ── event-targets
│  ├────502 (09.48%) -- top(https://www.youtube.com/watch?v=L0LMkIKyQuA&list=PLxf55Dca1uXHUDC-lvkb_Ei8VRAgtQU-Y&index=99, id=344)/active
│  │    ├──480 (09.06%) -- window(https://www.youtube.com/watch?v=L0LMkIKyQuA&list=PLxf55Dca1uXHUDC-lvkb_Ei8VRAgtQU-Y&index=99)/dom
│  │    │  ├──474 (08.95%) ── event-listeners
│  │    │  └────6 (00.11%) ── event-targets
│  │    └───22 (00.42%) ++ (2 tiny)
│  ├────501 (09.46%) -- top(https://www.youtube.com/watch?v=DKabFcMsFxw&list=PL8A6F8B8D9D800A8C&index=55, id=9)/active
│  │    ├──479 (09.04%) -- window(https://www.youtube.com/watch?v=DKabFcMsFxw&list=PL8A6F8B8D9D800A8C&index=55)/dom
│  │    │  ├──465 (08.78%) ── event-listeners
│  │    │  └───14 (00.26%) ── event-targets
│  │    └───22 (00.42%) ++ (2 tiny)
│  ├────425 (08.02%) -- top(https://bugzilla.mozilla.org/show_bug.cgi?id=1046384, id=478)/active
│  │    ├──421 (07.95%) -- window(https://bugzilla.mozilla.org/show_bug.cgi?id=1046384)/dom
│  │    │  ├──420 (07.93%) ── event-listeners
│  │    │  └────1 (00.02%) ── event-targets
│  │    └────4 (00.08%) ++ window(about:blank)/dom
│  ├────147 (02.77%) -- top(about:newtab, id=727)/active/window(about:newtab)/dom
│  │    ├──146 (02.76%) ── event-listeners
│  │    └────1 (00.02%) ── event-targets
│  └─────31 (00.59%) ++ (5 tiny)
└──────1 (00.02%) ── add-ons/{a0d7ccb3-214d-498b-b4aa-0e8fda9a7bf7}/window-objects/top(chrome://wot/content/rw/ratingwindow.html, id=8)/active/window(chrome://wot/content/rw/ratingwindow.html)/dom/event-listeners

8.29 MB (100.0%) -- images
├──7.71 MB (92.92%) -- content/raster/used
│  ├──4.00 MB (48.24%) ── uncompressed-heap
│  └──3.71 MB (44.68%) ── raw
└──0.59 MB (07.08%) -- chrome
   ├──0.53 MB (06.35%) ── vector/used/documents
   └──0.06 MB (00.72%) ── raster/used/uncompressed-heap

328.34 MB (100.0%) -- js-main-runtime
├──181.11 MB (55.16%) -- compartments
│  ├───82.23 MB (25.05%) -- shapes
│  │   ├──55.12 MB (16.79%) -- gc-heap
│  │   │  ├──26.08 MB (07.94%) -- tree
│  │   │  │  ├──23.26 MB (07.08%) ── global-parented
│  │   │  │  └───2.81 MB (00.86%) ── non-global-parented
│  │   │  ├──17.55 MB (05.34%) ── base
│  │   │  └──11.49 MB (03.50%) ── dict
│  │   └──27.12 MB (08.26%) -- malloc-heap
│  │      ├──17.10 MB (05.21%) ── compartment-tables
│  │      ├───5.15 MB (01.57%) ── dict-tables
│  │      ├───3.45 MB (01.05%) ── tree-tables
│  │      └───1.43 MB (00.43%) ── tree-shape-kids
│  ├───81.85 MB (24.93%) -- objects
│  │   ├──64.14 MB (19.54%) -- gc-heap
│  │   │  ├──43.59 MB (13.28%) ── function
│  │   │  ├──11.77 MB (03.58%) ── ordinary
│  │   │  ├───7.44 MB (02.27%) ── dense-array
│  │   │  └───1.34 MB (00.41%) ── cross-compartment-wrapper
│  │   ├──17.71 MB (05.39%) -- malloc-heap
│  │   │  ├──14.35 MB (04.37%) ── slots
│  │   │  ├───3.31 MB (01.01%) ── elements/non-asm.js
│  │   │  └───0.05 MB (00.02%) ++ (2 tiny)
│  │   └───0.00 MB (00.00%) ── non-heap/code/asm.js
│  ├───12.93 MB (03.94%) -- scripts
│  │   ├──10.57 MB (03.22%) ── gc-heap
│  │   └───2.37 MB (00.72%) ── malloc-heap/data
│  └────4.08 MB (01.24%) ++ (6 tiny)
├───83.83 MB (25.53%) -- zones
│   ├──48.53 MB (14.78%) ── unused-gc-things
│   ├──18.97 MB (05.78%) -- strings
│   │  ├──10.45 MB (03.18%) -- gc-heap
│   │  │  ├───6.77 MB (02.06%) ── latin1
│   │  │  └───3.67 MB (01.12%) ── two-byte
│   │  └───8.52 MB (02.60%) -- malloc-heap
│   │      ├──6.55 MB (01.99%) ── latin1
│   │      └──1.98 MB (00.60%) ── two-byte
│   ├───6.90 MB (02.10%) -- type-objects
│   │   ├──6.88 MB (02.10%) ── gc-heap
│   │   └──0.02 MB (00.01%) ── malloc-heap
│   ├───5.19 MB (01.58%) ++ (4 tiny)
│   └───4.24 MB (01.29%) ── type-pool
├───33.46 MB (10.19%) ── runtime
└───29.93 MB (09.12%) -- gc-heap
    ├──24.93 MB (07.59%) ── unused-arenas
    ├───4.00 MB (01.22%) ── chunk-admin
    └───1.00 MB (00.30%) ── unused-chunks

840 (100.0%) -- js-main-runtime-compartments
├──585 (69.64%) -- system
│  ├──333 (39.64%) ++ (332 tiny)
│  ├──239 (28.45%) ── [System Principal], inProcessTabChildGlobal?ownedBy=chrome://browser/content/browser.xul [239]
│  └───13 (01.55%) ── [System Principal], [anonymous sandbox] (from: resource://testpilot/modules/lib/securable-module.js:95) [13]
└──255 (30.36%) -- user
   ├──234 (27.86%) ── about:blank [234]
   └───21 (02.50%) ++ (14 tiny)

230.26 MB (100.0%) -- js-main-runtime-gc-heap-committed
├──155.79 MB (67.66%) -- used
│  ├──148.86 MB (64.65%) ── gc-things
│  ├────4.00 MB (01.74%) ── chunk-admin
│  └────2.93 MB (01.27%) ── arena-admin
└───74.47 MB (32.34%) -- unused
    ├──48.53 MB (21.08%) ── gc-things
    ├──24.93 MB (10.83%) ── arenas
    └───1.00 MB (00.43%) ── chunks

810 (100.0%) -- message-manager
└──810 (100.0%) -- referent
   ├──753 (92.96%) -- global-manager
   │  ├──753 (92.96%) ── strong
   │  └────0 (00.00%) ++ weak
   ├───52 (06.42%) -- parent-process-manager
   │   ├──52 (06.42%) ── strong
   │   └───0 (00.00%) ++ weak
   └────5 (00.62%) ++ child-process-manager

2,982 (100.0%) -- observer-service
└──2,982 (100.0%) -- referent
   ├──2,443 (81.92%) ── strong
   └────539 (18.08%) -- weak
        ├──538 (18.04%) ── alive
        └────1 (00.03%) ── dead

2,434 (100.0%) -- observer-service-suspect
├────330 (13.56%) ── referent(topic=memory-pressure)
├────257 (10.56%) ── referent(topic=network:offline-status-changed)
├────252 (10.35%) ── referent(topic=dom-storage2-changed)
├────249 (10.23%) ── referent(topic=browser:purge-session-history)
├────241 (09.90%) ── referent(topic=earlyformsubmit)
├────240 (09.86%) ── referent(topic=dom-window-destroyed)
├────239 (09.82%) ── referent(topic=browser:purge-domain-data)
├────237 (09.74%) ── referent(topic=author-style-disabled-changed)
├────237 (09.74%) ── referent(topic=style-sheet-applicable-state-changed)
└────152 (06.24%) ── referent(topic=xpcom-shutdown)

1,296 (100.0%) -- preference-service
└──1,296 (100.0%) -- referent
   ├────984 (75.93%) ── strong
   └────312 (24.07%) -- weak
        ├──312 (24.07%) ── alive
        └────0 (00.00%) ── dead

130.44 MB (100.0%) -- window-objects
├───86.22 MB (66.10%) -- dom
│   ├──73.94 MB (56.69%) ── orphan-nodes
│   ├───4.99 MB (03.82%) ── element-nodes
│   ├───3.21 MB (02.46%) ── event-targets
│   ├───2.18 MB (01.67%) ── other
│   ├───1.87 MB (01.44%) ── text-nodes
│   └───0.03 MB (00.02%) ++ (2 tiny)
├───32.04 MB (24.56%) -- layout
│   ├──22.55 MB (17.29%) ── style-sets
│   ├───3.46 MB (02.65%) ── frames
│   ├───3.30 MB (02.53%) ── pres-shell
│   └───2.73 MB (02.09%) ++ (5 tiny)
├───12.15 MB (09.31%) ── style-sheets
└────0.03 MB (00.03%) ── property-tables

        0.03 MB ── canvas-2d-pixels
        0.00 MB ── gfx-d2d-surface-cache
        4.00 MB ── gfx-d2d-surface-vram
       90.18 MB ── gfx-d2d-vram-draw-target
       10.64 MB ── gfx-d2d-vram-source-surface
        0.04 MB ── gfx-surface-win32
        0.00 MB ── gfx-textures
        0.00 MB ── gfx-tiles-waste
              0 ── ghost-windows
      194.36 MB ── gpu-committed
      254.96 MB ── gpu-dedicated
       29.85 MB ── gpu-shared
      331.16 MB ── heap-allocated
            378 ── heap-chunks
        1.00 MB ── heap-chunksize
      341.27 MB ── heap-committed
      378.00 MB ── heap-mapped
          3.05% ── heap-overhead-ratio
              1 ── host-object-urls
        0.01 MB ── imagelib-surface-cache
        1.96 MB ── js-main-runtime-temporary-peak
      780.68 MB ── private
      792.86 MB ── resident
    1,353.37 MB ── vsize
8,377,191.12 MB ── vsize-max-contiguous

End of Main Process
Flags: needinfo?(sg4-neuss)
another thing i just found, that might help to solve the problem:
it is not the actual ram usage that is increasing, but the vram.
i am sorry, that i didn't find it earlier.
i've met that problem too. Here is how i can reproduce it:
https://www.youtube.com/watch?v=EZGT5IgSkO4
update: still happens with build Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:34.0) Gecko/20100101 Firefox/34.0 ID:20140820030202 CSet: ffdd1a398105
branch update: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:35.0) Gecko/20100101 Firefox/35.0 ID:20140904030202 CSet: 776fa9cf70cd bug still appears.

If someone wants to go through my about:config, please contact me directly

@ luca892@hotmail.it, could you post your about:support here, so it can be compared with mine?
Flags: needinfo?(luca892)
Version: 34 Branch → 35 Branch
I am also facing this problem. My about:support content if it is of any help is below.


Application Basics
------------------

Name: Firefox
Version: 33.0
User Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
Multiprocess Windows: 0/1

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports

Extensions
----------

Name: Adblock Plus
Version: 2.6.4
Enabled: true
ID: {d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}

Name: British English Dictionary
Version: 1.19.1
Enabled: true
ID: en-GB@dictionaries.addons.mozilla.org

Name: Lietuvių kalbos rašybos tikrinimo žodynas
Version: 1.3
Enabled: true
ID: lt@dictionaries.addons.mozilla.org

Name: Speed Dial
Version: 0.9.6.16
Enabled: true
ID: {64161300-e22b-11db-8314-0800200c9a66}

Name: Tree Style Tab
Version: 0.14.2014051101
Enabled: true
ID: treestyletab@piro.sakura.ne.jp

Name: Unified Sidebar
Version: 0.1.2011111101
Enabled: true
ID: unifiedsidebar@piro.sakura.ne.jp

Name: All-in-One Sidebar
Version: 0.7.23
Enabled: false
ID: {097d3191-e6fa-4728-9826-b533d755359d}

Name: Firebug
Version: 2.0.4
Enabled: false
ID: firebug@software.joehewitt.com

Name: Flash Video Downloader - YouTube Full HD Download
Version: 6.1.2
Enabled: false
ID: artur.dubovoy@gmail.com

Name: Nightly Tester Tools
Version: 3.7
Enabled: false
ID: {8620c15f-30dc-4dba-a131-7c5d20cf4a29}

Name: Windows Media Player Extension for Firefox
Version: 1.1
Enabled: false
ID: jid0-nRwp7VvCqZcSRTppwWz2npqGEKw@jetpack

Graphics
--------

Adapter Description: Intel(R) HD Graphics 4000
Adapter Description (GPU #2): NVIDIA GeForce GT 620M
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter Drivers (GPU #2): nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: Unknown
Adapter RAM (GPU #2): 1024
Device ID: 0x0166
Device ID (GPU #2): 0x1140
Direct2D Enabled: true
DirectWrite Enabled: true (6.3.9600.17111)
Driver Date: 9-16-2013
Driver Date (GPU #2): 11-11-2013
Driver Version: 10.18.10.3308
Driver Version (GPU #2): 9.18.13.3182
GPU #2 Active: false
GPU Accelerated Windows: 1/1 Direct3D 11 (OMTC)
Vendor ID: 0x8086
Vendor ID (GPU #2): 0x10de
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4000 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d
AzureContentBackend: direct2d
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.parent_directory: F:\FirefoxCache
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 4
browser.cache.memory.capacity: 32768
browser.history_expire_days.mirror: 180
browser.places.createdDefaultQueries: true
browser.places.createdSmartBookmarks: true
browser.places.importBookmarksHTML: false
browser.places.importDefaults: false
browser.places.migratePostDataAnnotations: false
browser.places.smartBookmarksVersion: 7
browser.places.updateRecentTagsUri: false
browser.search.update: false
browser.sessionstore.upgradeBackup.latestBuildID: 20140902214533
browser.startup.homepage: chrome://speeddial/content/speeddial.xul
browser.startup.homepage_override.buildID: 20140902214533
browser.startup.homepage_override.mstone: 33.0
browser.tabs.animate: false
browser.tabs.closeWindowWithLastTab: false
browser.tabs.insertRelatedAfterCurrent: false
browser.tabs.loadFolderAndReplace: false
browser.tabs.onTop: false
dom.ipc.plugins.enabled.npietab2.dll: true
dom.max_script_run_time: 1800
dom.mozApps.used: true
dom.w3c_touch_events.expose: false
extensions.checkCompatibility: false
extensions.checkCompatibility.10.0: false
extensions.checkCompatibility.10.0a: false
extensions.checkCompatibility.11.0: false
extensions.checkCompatibility.11.0a: false
extensions.checkCompatibility.12.0: false
extensions.checkCompatibility.12.0a: false
extensions.checkCompatibility.13.0: false
extensions.checkCompatibility.13.0a: false
extensions.checkCompatibility.14.0: false
extensions.checkCompatibility.14.0a: false
extensions.checkCompatibility.15.0: false
extensions.checkCompatibility.15.0a: false
extensions.checkCompatibility.16.0: false
extensions.checkCompatibility.16.0a: false
extensions.checkCompatibility.17.0: false
extensions.checkCompatibility.17.0a: false
extensions.checkCompatibility.18.0: false
extensions.checkCompatibility.18.0a: false
extensions.checkCompatibility.19.0: false
extensions.checkCompatibility.19.0a: false
extensions.checkCompatibility.20.0: false
extensions.checkCompatibility.20.0a: false
extensions.checkCompatibility.21.0: false
extensions.checkCompatibility.21.0a: false
extensions.checkCompatibility.22.0: false
extensions.checkCompatibility.22.0a: false
extensions.checkCompatibility.3.6: false
extensions.checkCompatibility.3.6b: false
extensions.checkCompatibility.3.6p: false
extensions.checkCompatibility.3.6pre: false
extensions.checkCompatibility.3.7a: false
extensions.checkCompatibility.4.0: false
extensions.checkCompatibility.4.0b: false
extensions.checkCompatibility.4.0p: false
extensions.checkCompatibility.4.0pre: false
extensions.checkCompatibility.4.2: false
extensions.checkCompatibility.4.2a: false
extensions.checkCompatibility.4.2a1: false
extensions.checkCompatibility.4.2a1pre: false
extensions.checkCompatibility.4.2b: false
extensions.checkCompatibility.5.0: false
extensions.checkCompatibility.5.0a: false
extensions.checkCompatibility.5.0b: false
extensions.checkCompatibility.6.0: false
extensions.checkCompatibility.6.0a: false
extensions.checkCompatibility.6.0b: false
extensions.checkCompatibility.7.0: false
extensions.checkCompatibility.7.0a: false
extensions.checkCompatibility.7.0b: false
extensions.checkCompatibility.8.0: false
extensions.checkCompatibility.8.0a: false
extensions.checkCompatibility.9.0: false
extensions.checkCompatibility.9.0a: false
extensions.checkCompatibility.9.0b: false
extensions.checkCompatibility.nightly: false
extensions.lastAppVersion: 33.0
font.internaluseonly.changed: false
gfx.blacklist.suggested-driver-version: 10.6
gfx.direct3d.last_used_feature_level_idx: 0
gfx.direct3d.prefer_10_1: true
layers.accelerate-none: true
media.gmp-gmpopenh264.lastUpdate: 1410024021
media.gmp-gmpopenh264.version: 1.0
media.gmp-manager.lastCheck: 1410283530
network.cookie.prefsMigrated: true
network.http.pipelining: true
network.http.pipelining.firstrequest: true
network.http.pipelining.maxrequests: 16
network.http.proxy.pipelining: true
network.security.ports.banned: 8118,8123,9050,9051
places.database.lastMaintenance: 1410263503
places.history.expiration.transient_current_max_pages: 104375
places.history.expiration.transient_optimal_database_size: 116348846
places.last_vacuum: 1293373898
plugin.disable_full_page_plugin_for_types: audio/mpeg,audio/x-mpeg,application/pdf
plugin.importedState: true
plugin.state.npctrl: 1
plugin.state.npdeployjava: 0
plugin.state.npgeplugin: 0
plugin.state.npgoogleupdate: 0
plugin.state.npintelwebapiipt: 0
plugin.state.npintelwebapiupdater: 0
plugin.state.npnv3dv: 0
plugin.state.npnv3dvstreaming: 0
plugin.state.nppandowebplugin: 0
plugin.state.nppdf: 0
print.print_printer: Bullzip PDF Printer
print.printer_\\192.168.1.4\HP_LaserJet_1100_(MS).print_bgcolor: false
print.printer_\\192.168.1.4\HP_LaserJet_1100_(MS).print_bgimages: false
print.printer_\\192.168.1.4\HP_LaserJet_1100_(MS).print_command:
print.printer_\\192.168.1.4\HP_LaserJet_1100_(MS).print_downloadfonts: true
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user.js Preferences
-------------------

Your profile folder contains a user.js file, which includes preferences that were not created by Firefox.

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7

NSS
Expected minimum version: 3.17 Basic ECC
Version in use: 3.17 Basic ECC

NSSSMIME
Expected minimum version: 3.17 Basic ECC
Version in use: 3.17 Basic ECC

NSSSSL
Expected minimum version: 3.17 Basic ECC
Version in use: 3.17 Basic ECC

NSSUTIL
Expected minimum version: 3.17
Version in use: 3.17

Experimental Features
---------------------
Ok, it is related to HTML5 video playback.
If I use Youtube with HTML5 video player enabled - Firefox memory usage increases.
If I use Flash video playback - no memory increase.
OK, the V-RAM increase seems to be gone
but instead the ff now crashes after a short time minimized when trying to maximize it again while playing a HTML5 video
version: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:36.0) Gecko/20100101 Firefox/36.0 ID:20141108030205 CSet: eb0d3b3c0b22
Version: 35 Branch → 36 Branch
How to repeat in Windows 8.1:

1) Show task manager.
2) Go to Performance tab.
3) Go to myspace.com, or any site with html5 video and play a video (check it's an html5 video).
4) Minimise Firefox.
5) Watch the memory increase to Maximum Extreme.

Mozilla/5.0 (Windows NT 6.3; WOW64; rv:33.0) Gecko/20100101 Firefox/33.0
update on my end:
using Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:37.0) Gecko/20100101 Firefox/37.0 ID:20141215030201 CSet: f14dcd1c8c0b and don't encounter this problem anymore!

if there is no one else, who still has this bug, this bug-report can be closed.
Hello,

I'm also facing this problem.

I can reproduce it consistently using the user script bellow, which forces HTML5 on youtube, or with any HTML5 video player: 
http://isebaro.com/viewtube/?ln=en

It's worth mentioning this happens with all addons disabled (even with the userscript disabled) and with both the latest nightly and the most recent version of firefox. It doesn't appear to happen in safe-mode.

Here's a screen capture of how far it can go in just 1 minute:
http://i.imgur.com/KEra6Be.png?1

Here's my about:support for the latest nightly:

------------------------------------------------------------
Application Basics
------------------

Name: Firefox
Version: 37.0a1
User Agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:37.0) Gecko/20100101 Firefox/37.0
Multiprocess Windows: 0/2

Crash Reports for the Last 3 Days
---------------------------------

Report ID: bp-a8c3a3df-00dd-4686-a27a-06c462141226
Submitted: 2 days ago

All Crash Reports (including 1 pending crash in the given time range)

Extensions
----------

Name: Adblock Edge
Version: 2.1.7
Enabled: true
ID: {fe272bd1-5f76-4ea4-8501-a05d35d823fc}

Name: Element Hiding Helper for Adblock Plus
Version: 1.3
Enabled: true
ID: elemhidehelper@adblockplus.org

Name: Flagfox
Version: 5.0.10
Enabled: true
ID: {1018e4d6-728f-4b20-ad56-37578a4de76b}

Name: Greasemonkey
Version: 2.3
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: NoScript
Version: 2.6.9.10
Enabled: true
ID: {73a6fe31-595d-460b-a920-fcc0f8843232}

Name: Session Manager
Version: 0.8.1.6
Enabled: false
ID: {1280606b-2510-4fe0-97ef-9b5a22eafe30}

Name: UnMHT
Version: 7.3.0.3
Enabled: false
ID: {f759ca51-3a91-4dd1-ae78-9db5eee9ebf0}

Graphics
--------

Adapter Description: Intel(R) HD Graphics 4600
Adapter Description (GPU #2): NVIDIA GeForce GTX 850M
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter Drivers (GPU #2): nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: Unknown
Adapter RAM (GPU #2): 2048
ClearType Parameters: Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 400
Device ID: 0x0416
Device ID (GPU #2): 0x1391
Direct2D Enabled: true
DirectWrite Enabled: true (6.3.9600.17415)
Driver Date: 10-9-2014
Driver Date (GPU #2): 3-27-2014
Driver Version: 10.18.10.3977
Driver Version (GPU #2): 9.18.13.3750
GPU #2 Active: false
GPU Accelerated Windows: 2/2 Direct3D 11 (OMTC)
Subsys ID: 65011558
Subsys ID (GPU #2): 65011558
Vendor ID: 0x8086
Vendor ID (GPU #2): 0x10de
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D11 vs_5_0 ps_5_0)
windowLayerManagerRemote: true
AzureCanvasBackend: direct2d 1.1
AzureContentBackend: direct2d 1.1
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

accessibility.typeaheadfind.flashBar: 0
browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 3
browser.places.smartBookmarksVersion: 7
browser.search.update: false
browser.sessionstore.upgradeBackup.latestBuildID: 20141227030218
browser.startup.homepage: https://encrypted.google.com/
browser.startup.homepage_override.buildID: 20141227030218
browser.startup.homepage_override.mstone: 37.0a1
browser.tabs.remote.autostart.1: false
dom.mozApps.used: true
extensions.lastAppVersion: 37.0a1
font.internaluseonly.changed: false
gfx.direct3d.last_used_feature_level_idx: 0
media.gmp-gmpopenh264.enabled: false
media.gmp-manager.lastCheck: 1419775512
media.navigator.video.default_fps: 60
network.cookie.prefsMigrated: true
places.database.lastMaintenance: 1419743551
places.history.expiration.transient_current_max_pages: 104858
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugin.state.npdeployjava: 0
plugin.state.npspwrap: 0
plugins.notifyMissingFlash: false
privacy.cpd.extensions-sessionmanager: false
privacy.cpd.offlineApps: true
privacy.cpd.siteSettings: true
privacy.donottrackheader.enabled: true
privacy.sanitize.migrateFx3Prefs: true
privacy.sanitize.timeSpan: 0
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1418091437

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7

NSS
Expected minimum version: 3.17.3 Basic ECC
Version in use: 3.17.3 Basic ECC

NSSSMIME
Expected minimum version: 3.17.3 Basic ECC
Version in use: 3.17.3 Basic ECC

NSSSSL
Expected minimum version: 3.17.3 Basic ECC
Version in use: 3.17.3 Basic ECC

NSSUTIL
Expected minimum version: 3.17.3
Version in use: 3.17.3

Experimental Features
---------------------
i noticed this happening in firefox v35 too. Fresh installation(deleted old customization&profile from appdata) and the shared memory still leaks like crazy while minimized and playing mp4/html5 video, it happens on any site not only youtube. When the window is restored the memory usage returns to normal. Latest driver installed for both intel and nvidia gpus, latest updates for windows7.
The strange thing is that this doesn't happen when i run in safe mode. But why? this is a fresh installation, no addons or themes or anything is changed from default.
What else is changed when starting in safemode?
i disabled hardware acceleration and it isn't happening anymore, so it's clearly something wrong.

Application Basics
------------------

Name: Firefox
Version: 35.0
User Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:35.0) Gecko/20100101 Firefox/35.0
Multiprocess Windows: 0/1

Crash Reports for the Last 3 Days
---------------------------------

All Crash Reports

Extensions
----------

Graphics
--------

Adapter Description: Intel(R) HD Graphics 4600
Adapter Description (GPU #2): NVIDIA GeForce GT 740M
Adapter Drivers: igdumdim64 igd10iumd64 igd10iumd64 igdumdim32 igd10iumd32 igd10iumd32
Adapter Drivers (GPU #2): nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: Unknown
Adapter RAM (GPU #2): 2048
Device ID: 0x0416
Device ID (GPU #2): 0x1292
DirectWrite Enabled: false (6.2.9200.16571)
Driver Date: 1-5-2015
Driver Date (GPU #2): 12-13-2014
Driver Version: 10.18.14.4080
Driver Version (GPU #2): 9.18.13.4709
GPU #2 Active: false
GPU Accelerated Windows: 0/1 Basic (OMTC)
Subsys ID: 502317aa
Subsys ID (GPU #2): 502317aa
Vendor ID: 0x8086
Vendor ID (GPU #2): 0x10de
WebGL Renderer: Google Inc. -- ANGLE (Intel(R) HD Graphics 4600 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote: true
AzureCanvasBackend: skia
AzureContentBackend: cairo
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

browser.cache.disk.capacity: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 3
browser.places.smartBookmarksVersion: 7
browser.sessionstore.upgradeBackup.latestBuildID: 20150108202552
browser.startup.homepage_override.buildID: 20150108202552
browser.startup.homepage_override.mstone: 35.0
dom.mozApps.used: true
extensions.lastAppVersion: 35.0
gfx.direct2d.disabled: true
layers.acceleration.disabled: true
media.gmp-gmpopenh264.lastUpdate: 1421942867
media.gmp-gmpopenh264.version: 1.1
media.gmp-manager.lastCheck: 1421942866
network.cookie.prefsMigrated: true
places.history.expiration.transient_current_max_pages: 100847
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
privacy.sanitize.migrateFx3Prefs: true

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7

NSS
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC

NSSSMIME
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC

NSSSSL
Expected minimum version: 3.17.2 Basic ECC
Version in use: 3.17.2 Basic ECC

NSSUTIL
Expected minimum version: 3.17.2
Version in use: 3.17.2

Experimental Features
---------------------
I have the same bug.

1/ Open YouTube
2/ Look an HTML5 video 
3/ Minimize FF, memory goes north
4/ Maximize FF, memory stays mostly at same level
5/ Minimize FF again, memory goes up again

I have FF 35.0.1

Name 	Firefox
Version 	35.0.1

Extensions
Name 	Version 	Enabled 	ID
Adblock Plus	2.6.7	true	{d10d0bf8-f5b5-c8b4-a8b2-2b9879e08c5d}
FireShot	0.98.65	true	{0b457cAA-602d-484a-8fe7-c1d894a011ba}
Flash and Video Download	1.66	true	{bee6eb20-01e0-ebd1-da83-080329fb9a3a}
selectivecookiedelete	4.1	true	selectivecookiedelete@siju.mathew
Test Pilot	1.2.3	true	testpilot@labs.mozilla.com
YouTube to MP3	1.2.3	true	youtube2mp3@mondayx.de
IDS_SS_NAME	IDS_SS_VERSION	false	{D19CA586-DD6C-4a0a-96F8-14644F340D60}


Graphics
Adapter Description	Intel(R) HD Graphics 3000
Adapter Drivers	igdumd64 igd10umd64 igd10umd64 igdumd32 igd10umd32 igd10umd32
Adapter RAM	Unknown
Device ID	0x0126
Direct2D Enabled	true
DirectWrite Enabled	true (6.1.7601.18245)
Driver Date	9-26-2012
Driver Version	9.17.10.2867
GPU #2 Active	false
GPU Accelerated Windows	1/1 Direct3D 11 (OMTC)
Subsys ID	04941028
Vendor ID	0x8086
WebGL Renderer	Google Inc. -- ANGLE (Intel(R) HD Graphics 3000 Direct3D9Ex vs_3_0 ps_3_0)
windowLayerManagerRemote	true
AzureCanvasBackend	direct2d
AzureContentBackend	direct2d
AzureFallbackCanvasBackend	cairo
AzureSkiaAccelerated	0


Important Modified Preferences
Name 	Value accessibility.typeaheadfind.flashBar	0
browser.cache.disk.capacity	358400
browser.cache.disk.smart_size_cached_value	358400
browser.cache.disk.smart_size.first_run	false
browser.cache.disk.smart_size.use_old_max	false
browser.cache.frecency_experiment	2
browser.display.background_color	#C0C0C0
browser.display.use_system_colors	true
browser.fixup.domainwhitelist.xtremisweb	true
browser.history_expire_days.mirror	180
browser.places.importBookmarksHTML	false
browser.places.importDefaults	false
browser.places.leftPaneFolderId	-1
browser.places.migratePostDataAnnotations	false
browser.places.smartBookmarksVersion	7
browser.places.updateRecentTagsUri	false
browser.search.useDBForOrder	true
browser.sessionstore.upgradeBackup.latestBuildID	20150122214805
browser.startup.homepage	http://novaprima:8080/wiki/
browser.startup.homepage_override.buildID	20150122214805
browser.startup.homepage_override.mstone	35.0.1
browser.tabs.warnOnClose	false
dom.mozApps.used	true
dom.w3c_touch_events.expose	false
extensions.lastAppVersion	35.0.1
font.internaluseonly.changed	true
gfx.blacklist.suggested-driver-version	10.6
gfx.direct3d.last_used_feature_level_idx	0
gfx.direct3d.prefer_10_1	true
media.gmp-gmpopenh264.lastUpdate	1423471024
media.gmp-gmpopenh264.version	1.3
media.gmp-manager.lastCheck	1423657704
network.cookie.prefsMigrated	true
places.database.lastMaintenance	1423730618
places.history.expiration.transient_current_max_pages	104286
places.history.expiration.transient_optimal_database_size	128647330
plugin.disable_full_page_plugin_for_types	application/pdf
plugin.importedState	true
plugins.notifyMissingFlash	false

privacy.donottrackheader.enabled	true
privacy.sanitize.migrateFx3Prefs	true
security.disable_button.openDeviceManager	false
security.warn_viewing_mixed	false
storage.vacuum.last.index	1
storage.vacuum.last.places.sqlite	1422977712


JavaScript
Incremental GC 	true
Accessibility
Activated 	false
Prevent Accessibility 	0
Library Versions
	Expected minimum version	Version in use
NSPR	4.10.7	4.10.7
NSS	3.17.2 Basic ECC	3.17.2 Basic ECC
NSSSMIME	3.17.2 Basic ECC	3.17.2 Basic ECC
NSSSSL	3.17.2 Basic ECC	3.17.2 Basic ECC
NSSUTIL	3.17.2	3.17.2
The memory leak seems to be related to the latest intel video driver. This doesn't happen when i start firefox with the nvidia card and neither to others with radeon cards(+latest video drivers). Or others with an old intel video driver.
Strangely, the memory leak happens only in firefox(during html5 video while minimized), other applications have not suffered from this update.
fixed in firefox 36.0 for me...
It is happening to me with firefox 36, an nvidia gt 630 video (latest video drivers) card and hardware acceleration enabled. If i disable hardware aceleration memory consumption does not raise.

However, i don´t have this problem with a radeon r9 270x video card (latest video drivers) and hardware acceleration enabled.
Application Basics
------------------

Name: Cyberfox
Version: 36.0
User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:36.0) Gecko/20100101 Firefox/36.0 Cyberfox/36.0
Multiprocess Windows: 0/1

Extensions
----------

Name: 1-Click YouTube Video Downloader
Version: 2.3.8
Enabled: true
ID: YoutubeDownloader@PeterOlayev.com

Name: Adblock Edge
Version: 2.1.8
Enabled: true
ID: {fe272bd1-5f76-4ea4-8501-a05d35d823fc}

Name: Add Bookmark Here ²
Version: 31.0.20150113
Enabled: true
ID: abhere2@moztw.org

Name: Bookmarks Checker - check for bad links
Version: 3.1.1
Enabled: true
ID: firefoxbookmarkchecker@everhelper.me

Name: Context Search X
Version: 0.4.6.21
Enabled: true
ID: contextsearch2@lwz.addons.mozilla.org

Name: Cookie Whitelist, With Buttons
Version: 3.0
Enabled: true
ID: cwwb@dietrich.cx

Name: Customizations for Adblock Plus
Version: 1.0.4a.91
Enabled: true
ID: customization@adblockplus.org

Name: Download Status Bar
Version: 12.3.0
Enabled: true
ID: {6c28e999-e900-4635-a39d-b1ec90ba0c0f}

Name: DownThemAll!
Version: 2.0.18
Enabled: true
ID: {DDC359D1-844A-42a7-9AA1-88A850A938A8}

Name: Element Hiding Helper for Adblock Plus
Version: 1.3.1.485
Enabled: true
ID: elemhidehelper@adblockplus.org

Name: FavIconReloader
Version: 0.8
Enabled: true
ID: FavIconReloader@mozilla.org

Name: FEBE
Version: 8.3.1
Enabled: true
ID: {4BBDD651-70CF-4821-84F8-2B918CF89CA3}

Name: Fire IE
Version: 0.4.4
Enabled: true
ID: fireie@fireie.org

Name: FireFTP
Version: 2.0.22
Enabled: true
ID: {a7c6cf7f-112c-4500-a7ea-39801a327e5f}

Name: Forecastfox
Version: 2.2.4
Enabled: true
ID: {0538E3E3-7E9B-4d49-8831-A227C80A7AD3}

Name: Google Reverse Image Search
Version: 35.0
Enabled: true
ID: {95322c08-05ff-4f3c-85fd-8ceb821988dd}

Name: Google Translator for Firefox
Version: 2.1.0.3m
Enabled: true
ID: translator@zoli.bod

Name: Googlebar Lite
Version: 5.0.6
Enabled: true
ID: {79c50f9a-2ffe-4ee0-8a37-fae4f5dacd4f}

Name: Greasemonkey
Version: 2.3
Enabled: true
ID: {e4a8a97b-f2ed-450b-b12d-ee082ba24781}

Name: Image Zoom
Version: 0.6.3
Enabled: true
ID: {1A2D0EC4-75F5-4c91-89C4-3656F6E44B68}

Name: ImageHost Grabber
Version: 1.6.5.5
Enabled: true
ID: {E4091D66-127C-11DB-903A-DE80D2EFDFE8}

Name: LastPass
Version: 3.1.77
Enabled: true
ID: support@lastpass.com

Name: Mozilla Archive Format
Version: 3.0.4
Enabled: true
ID: {7f57cf46-4467-4c2d-adfa-0cba7c507e54}

Name: NoScript
Version: 2.6.9.15
Enabled: true
ID: {73a6fe31-595d-460b-a920-fcc0f8843232}

Name: Reload Plus
Version: 4.4.0
Enabled: true
ID: reloadplus@blackwind

Name: Screengrab (fix version)
Version: 0.98.05c
Enabled: true
ID: {02450914-cdd9-410f-b1da-db004e18c671}

Name: Strict Pop-up Blocker
Version: 0.2
Enabled: true
ID: jid1-P34HaABBBpOerQ@jetpack

Name: Zoom Page
Version: 12.1
Enabled: true
ID: zoompage@DW-dev

Graphics
--------

Adapter Description: NVIDIA GeForce GT 630
Adapter Drivers: nvd3dumx,nvwgf2umx,nvwgf2umx nvd3dum,nvwgf2um,nvwgf2um
Adapter RAM: 2048
ClearType Parameters: Gamma: 2200 Pixel Structure: R ClearType Level: 100 Enhanced Contrast: 400
Device ID: 0x0f00
DirectWrite Enabled: true (6.2.9200.16571)
Driver Date: 2-5-2015
Driver Version: 9.18.13.4752
GPU #2 Active: false
GPU Accelerated Windows: 0/1 Basic (OMTC)
Subsys ID: 00000000
Vendor ID: 0x10de
windowLayerManagerRemote: true
AzureCanvasBackend: skia
AzureContentBackend: cairo
AzureFallbackCanvasBackend: cairo
AzureSkiaAccelerated: 0

Important Modified Preferences
------------------------------

accessibility.typeaheadfind.flashBar: 0
browser.cache.compression_level: 1
browser.cache.disk_cache_ssl: false
browser.cache.disk.capacity: 358400
browser.cache.disk.parent_directory: F:\
browser.cache.disk.smart_size_cached_value: 358400
browser.cache.disk.smart_size.first_run: false
browser.cache.disk.smart_size.use_old_max: false
browser.cache.frecency_experiment: 1
browser.cache.memory.capacity: -1
browser.places.smartBookmarksVersion: 7
browser.search.useDBForOrder: true
browser.sessionstore.max_tabs_undo: 0
browser.sessionstore.max_windows_undo: 0
browser.sessionstore.resume_from_crash: false
browser.sessionstore.upgradeBackup.latestBuildID: 20150224140509
browser.startup.homepage: http://www.majorgeeks.com/|http://www.free-codecs.com/index.htm|http://sceper.ws/|http://www.eldiariodechihuahua.mx/|htt
browser.startup.homepage_override.buildID: 20150224140509
browser.startup.homepage_override.mstone: 36.0
browser.tabs.warnOnClose: false
browser.tabs.warnOnCloseOtherTabs: false
browser.tabs.warnOnOpen: false
dom.ipc.plugins.enabled.npietab2.dll: true
dom.max_chrome_script_run_time: 60
dom.mozApps.used: true
extensions.checkCompatibility: true
extensions.lastAppVersion: 36.0
font.internaluseonly.changed: false
gfx.direct2d.disabled: true
gfx.direct3d.last_used_feature_level_idx: 0
gfx.font_rendering.directwrite.enabled: true
html5.enable: true
layers.acceleration.disabled: true
media.gmp-gmpopenh264.lastUpdate: 1423165833
media.gmp-gmpopenh264.version: 1.3
media.gmp-manager.lastCheck: 1425063374
network.cookie.cookieBehavior: 2
network.cookie.lifetimePolicy: 2
network.cookie.prefsMigrated: true
network.dns.disableIPv6: true
network.http.pipelining: true
network.http.pipelining.maxrequests: 8
network.http.proxy.pipelining: true
places.database.lastMaintenance: 1424977638
places.history.expiration.transient_current_max_pages: 90741
plugin.disable_full_page_plugin_for_types: application/pdf
plugin.importedState: true
plugins.notifyMissingFlash: false
print.printer_EPSON_L110_Series.print_bgcolor: false
print.printer_EPSON_L110_Series.print_bgimages: false
print.printer_EPSON_L110_Series.print_colorspace:
print.printer_EPSON_L110_Series.print_command:
print.printer_EPSON_L110_Series.print_downloadfonts: false
print.printer_EPSON_L110_Series.print_duplex: 1515870810
print.printer_EPSON_L110_Series.print_edge_bottom: 0
print.printer_EPSON_L110_Series.print_edge_left: 0
print.printer_EPSON_L110_Series.print_edge_right: 0
print.printer_EPSON_L110_Series.print_edge_top: 0
print.printer_EPSON_L110_Series.print_evenpages: true
print.printer_EPSON_L110_Series.print_footercenter:
print.printer_EPSON_L110_Series.print_footerleft:
print.printer_EPSON_L110_Series.print_footerright:
print.printer_EPSON_L110_Series.print_headercenter:
print.printer_EPSON_L110_Series.print_headerleft:
print.printer_EPSON_L110_Series.print_headerright:
print.printer_EPSON_L110_Series.print_in_color: true
print.printer_EPSON_L110_Series.print_margin_bottom: 0
print.printer_EPSON_L110_Series.print_margin_left: 0
print.printer_EPSON_L110_Series.print_margin_right: 0
print.printer_EPSON_L110_Series.print_margin_top: 0
print.printer_EPSON_L110_Series.print_oddpages: true
print.printer_EPSON_L110_Series.print_orientation: 0
print.printer_EPSON_L110_Series.print_page_delay: 50
print.printer_EPSON_L110_Series.print_paper_data: 1
print.printer_EPSON_L110_Series.print_paper_height: 11.00
print.printer_EPSON_L110_Series.print_paper_name:
print.printer_EPSON_L110_Series.print_paper_size_type: 0
print.printer_EPSON_L110_Series.print_paper_size_unit: 0
print.printer_EPSON_L110_Series.print_paper_width: 8.50
print.printer_EPSON_L110_Series.print_plex_name:
print.printer_EPSON_L110_Series.print_resolution: 1515870810
print.printer_EPSON_L110_Series.print_resolution_name:
print.printer_EPSON_L110_Series.print_reversed: false
print.printer_EPSON_L110_Series.print_scaling: 1.19
print.printer_EPSON_L110_Series.print_shrink_to_fit: false
print.printer_EPSON_L110_Series.print_to_file: false
print.printer_EPSON_L110_Series.print_unwriteable_margin_bottom: 0
print.printer_EPSON_L110_Series.print_unwriteable_margin_left: 0
print.printer_EPSON_L110_Series.print_unwriteable_margin_right: 0
print.printer_EPSON_L110_Series.print_unwriteable_margin_top: 0
privacy.donottrackheader.enabled: true
privacy.popups.showBrowserMessage: false
privacy.sanitize.migrateFx3Prefs: true
security.disable_button.openCertManager: false
security.disable_button.openDeviceManager: false
storage.vacuum.last.index: 1
storage.vacuum.last.places.sqlite: 1424110791
svg.smil.enabled: true
webgl.disabled: true

Important Locked Preferences
----------------------------

JavaScript
----------

Incremental GC: true

Accessibility
-------------

Activated: false
Prevent Accessibility: 0

Library Versions
----------------

NSPR
Expected minimum version: 4.10.7
Version in use: 4.10.7

NSS
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC

NSSSMIME
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC

NSSSSL
Expected minimum version: 3.17.4 Basic ECC
Version in use: 3.17.4 Basic ECC

NSSUTIL
Expected minimum version: 3.17.4
Version in use: 3.17.4

Experimental Features
---------------------
Also fixed in firefox 36.0 for me... :) Nice one.
(In reply to hipoalergeniko from comment #24)
> It is happening to me with firefox 36

First thing, i see you using cyberfox. Does this happen while using the "normal" firefox?
(In reply to George from comment #26)
> (In reply to hipoalergeniko from comment #24)
> > It is happening to me with firefox 36
> 
> First thing, i see you using cyberfox. Does this happen while using the
> "normal" firefox?

Yes, it does.
Component: Audio/Video → Audio/Video: Playback
IIRC this issue was fixed in 36.
Status: UNCONFIRMED → RESOLVED
Closed: 9 years ago
Resolution: --- → WORKSFORME
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