1225900 - Browser not responsive on localized https://support.microsoft.com/

Status: RESOLVED WORKSFORME

(Core :: JavaScript Engine, defect)

Description

[Alice0775 White]

Steps to reproduce:
1. Open https://support.microsoft.com/ja-jp/kb/3102810

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.

Script: https://ssl.microsofttranslator.com/ajax/v2/widget.aspx?siteData=PPcVDCtb6VbSFZgKOk4E16C6oqgos_b88CQZYRIzKP-YKH73GnfYWj3aBe54c0tKFnlCrWFnuSoVKlMvmHXPzhKDwKGE4_YnZE4M4E65v5jgTdHwbeuNNQroSrYWq53Z&mode=manual&from=en&layout=ts&to=ja&originalDocument=/api/content/kbctf/3102810&category=e9b9dd63-c277-4572-9d08-fd459d9b844d_tech&_=1447865028326:2


Chrome works fine.

Comment 1

[ovidiu boca[:Ovidiu]]

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

Hi, 
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.

Comment 2

[ovidiu boca[:Ovidiu]]

You can reproduce this problem with FF Nightly 46.0a1?

Comment 3

[Alice0775 White]

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.

https://hg.mozilla.org/mozilla-central/rev/5644818538de2413cce52551e32b025e6c7e352e
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:46.0) Gecko/20100101 Firefox/46.0 ID:20160117030215

Comment 4

[ovidiu boca[:Ovidiu]]

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%.

Comment 5

[Alice0775 White]

there are no plugin.

Comment 6

[xunxun]

Attachment: 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

[YF (Yang)]

Also happen for https://support.mozilla.org/en-US/kb/fix-video-audio-problems-firefox-windows/discuss/6335.

Comment 8

[YF (Yang)]

https://hg.mozilla.org/mozilla-central/pushloghtml?fromchange=e017c15325ae&tochange=b85b57f05fda

Comment 9

[Ton [:Tonnes]]

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

[michael]

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.

Comment 11

[Ciprian Muresan [:cmuresan], Formerly of Ecosystem QA - please needinfo @mcoman for things regarding the team]

Hi,

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?

Comment 12

[Andrew Overholt [:overholt]]

I captured this in the profiler: https://cleopatra.io/#report=57962c5d5a7cab41b9a0613ddb1c9759f37d13cd

Comment 13

[Andrew Overholt [:overholt]]

We're mostly in js::RunScript so maybe it's something in the JS engine?

Comment 14

[Liz Henry (:lizzard) (relman/hg->git project)]

Regression since at least 42. Too late to fix this for 46.  
Naveed can you help find someone to take on this bug?

Comment 15

[Jason Orendorff [:jorendorff]]

Clearing ni? since Morgan took this bug.

Comment 16

[Jason Orendorff [:jorendorff]]

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?

Comment 17

[Jonathan Watt [:jwatt]]

Mass bug change to replace various 'parity' whiteboard flags with the new canonical keywords. (See bug 1443764 comment 13.)

Comment 18

[Pablo]

Hi allice
I have been trying to replicate this old issue using windows10 64bit and also windows7 64bit
using Firefox Release 85 and Firefox ESR 78.7.0 and the page loads fast and i do not see any memory problems.

Could you please let me know if this is still an issue on your machine?
thanks
Pablo

Comment 19

[Alice0775 White]

The problem is no longer reproduced in Nightly87.0a1 and Firefox78.7.0 Windows10.