Browser not responsive on localized

Assigned to



JavaScript Engine
2 years ago
2 years ago


(Reporter: Alice0775 White, Assigned: mrrrgn)


(Depends on: 1 bug, {hang, regression, regressionwindow-wanted})

32 Branch
hang, regression, regressionwindow-wanted

Firefox Tracking Flags

(firefox42 wontfix, firefox43 wontfix, firefox44 wontfix, firefox45 wontfix, firefox46 wontfix, firefox47 wontfix, firefox48+ wontfix, firefox49 wontfix, firefox-esr38 wontfix, firefox-esr45 ?)


(Whiteboard: [parity-IE] [parity-Chrome][parity-Edge], URL)


(1 attachment)



2 years ago
Steps to reproduce:
1. Open

Actual Results:
Browser not responsive.
And the following alert pops up:

A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete.


Chrome works fine.


2 years ago
status-firefox42: --- → affected
status-firefox43: --- → affected
status-firefox44: --- → affected
status-firefox-esr38: --- → affected

Comment 1

2 years ago
Build ID: 20151202115311
User Agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64; rv:45.0) Gecko/20100101 Firefox/45.0

I tested this problem on latest Nightly 45.0a1 and I don't receive the pops up alert, but the page is loaded very slow.
OS: Unspecified → Windows 7
Hardware: Unspecified → x86_64

Comment 2

2 years ago
You can reproduce this problem with FF Nightly 46.0a1?
Flags: needinfo?(alice0775)

Comment 3

2 years ago
I can see the popup "A web page is slowing down your browser. What would you like to do?".
And plugin-container.exe consumes 100%core usage.
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0 ID:20160117030215
Flags: needinfo?(alice0775)

Comment 4

2 years ago
Thank you Alice for confirming this, on Firefox 46.0a1.
I have tested on Win 7 X64 with Nightly 46.0a1(2016-1-18) and I can see the popup but the but my CPU usage is around 30% for 1 sec and the drops to >10%.
Component: Untriaged → Plug-ins

Comment 5

2 years ago
there are no plugin.
status-firefox46: --- → affected
status-firefox47: --- → affected
status-firefox-esr45: --- → ?
Component: Plug-ins → General
Whiteboard: [parity-IE] [parity-Chrome][parity-Edge]

Comment 6

2 years ago
Created attachment 8717770 [details]
Cleopatra nightly disable e10s

I have a nightly profile which can reproduce it ( disabled e10s ), but I can't upload it through Cleopatra ("Error 0 occurred uploading your file."), so I upload it here.

Comment 7

2 years ago
Also happen for
Component: General → Untriaged
OS: Windows 7 → Windows
Hardware: x86_64 → All
Summary: Browser not responsive on → Browser not responsive on localized

Comment 8

2 years ago
Has Regression Range: --- → no
Has STR: --- → yes
Keywords: regression, regressionwindow-wanted
Version: Trunk → 32 Branch

Comment 9

2 years ago
Maybe it’s useful to know that most users seem to report such pages to load fine (or faster) when the script is stopped. However and for some reason, I can stop the script (on Win 7 32) but the error returns and the problem persists, so I need to quickly close the tab after stopping it (which may take a few tries).

Comment 10

2 years ago
The page loaded on mac and the popup appeared in a few seconds. That's all one can get while using the site. As Tonnes says, it's stresfull trying to close that tab.

I've managed to reproduce the issue on the latest Nightly (48.0a1, Build ID 20160413030239) on Windows 10 x64. I'm also fairly convinced this isn't a regression since I've been able to reproduce the slow script dialog and hang even on Nightly 20.0a1.
I've also tried to get a Gecko profile, but was unable to do so because once I click analyze I get stuck on "Retrieving profile" for an unreasonable amount of time. I've tried using the internal profiler and the same thing occurred there.

Andrew, do you have any idea what component we could assign here?
Flags: needinfo?(overholt)
We're mostly in js::RunScript so maybe it's something in the JS engine?
Component: Untriaged → JavaScript Engine
Flags: needinfo?(overholt)
Regression since at least 42. Too late to fix this for 46.  
Naveed can you help find someone to take on this bug?
status-firefox46: affected → wontfix
status-firefox48: --- → affected
tracking-firefox48: --- → +
Flags: needinfo?(nihsanullah)


2 years ago
Assignee: nobody → winter2718
Clearing ni? since Morgan took this bug.
Flags: needinfo?(nihsanullah)
One: The browser becomes unresponsive because that's what we do when JS just runs and runs. E10S regressed this, somewhat - the behavior is worse than it was. But it was never great. We should consider a number of changes to improve the experience when this happens.

Two: It's presumably a bug in the page that the JS just runs and runs. But this is hard for us to debug. The JS is obfuscated, and it's part of an API that requires an access token, so the page won't run from a file: URL. Is there any chance of finding anyone at Microsoft we can work with?


2 years ago
status-firefox42: affected → wontfix
status-firefox43: affected → wontfix
status-firefox44: affected → wontfix
status-firefox45: affected → wontfix
status-firefox47: affected → wontfix
status-firefox48: affected → wontfix
status-firefox49: --- → wontfix
status-firefox-esr38: affected → wontfix


2 years ago
Depends on: 1269917
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