Closed Bug 1924423 Opened 1 year ago Closed 1 year ago

Crashes following upgrade to firefox 131.0.2

Categories

(Core :: Networking, defect)

Product:
Core
Component:
Networking
Version:
Firefox 131
Type:
defect

Tracking

()

Status:
RESOLVED FIXED

People

(Reporter: arnold.trembley, Unassigned)

References

Details

Crash Data

Attachments

(2 files)

About:support
50.31 KB, text/plain
Details
Firefox 131.0.2 crash
81 bytes, text/plain
Details

User Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:131.0) Gecko/20100101 Firefox/131.0

Steps to reproduce:

After upgrading to Firefox 131.0.2 on Windows 11 Pro, I am experiencing problems loading Amazon and Youtube websites. Pages load extremely slowly or not at all. Trying to play a youtube video results in a halt after about 30 seconds. Then frequently the browser crashes, files a report, and must be restarted. I may have had problems reaching cloudfare for the new DNS over https feature.

Actual results:

see above. I have had to switch to LibreWolf Portable (based on Mozilla Firefox) in order to view websites I normally work with. The same performance problems occur with multiple websites, but not with Yahoo.com or wsj.com.

Expected results:

Performance should not have degraded after updating from firefox 130 to 131.02

The Bugbug bot thinks this bug should belong to the 'Core::Networking' component, and is moving the bug to that component. Please correct in case you think the bot is wrong.

Component: Untriaged → Networking
Product: Firefox → Core

can you :

  1. Type "about:support" into your Firefox browsers address-bar, and copy-paste its contents here
  2. Reproduce the crash on your Firefox browser and submit the crash report. Then go to "about:crashes" into the Firefox browsers address-bar, and click on a crash link. It will take you to a link like "https://crash-stats.mozilla.org/report/index/XXXXXXX" . Please copy-paste that URL here.
  3. If this bug started occuring in a recent version, could you use mozregression GUI (which needs 0 setup) to find a regression range?

Thanks!

Flags: needinfo?(arnold.trembley)
Attached file About:support —
about:support :

couldn't reproduce (pages still load slow or not at all, now sourceforge.net and youtube.com), but I had a previous crash from earlier today submitted. Here is the link:
https://crash-stats.mozilla.org/report/index/a586039b-feb9-4fd8-89d9-b49260241014

Because youtube is not working from my Firefox 131.0.2, I am not able to play the video showing how to install Mozregression. So I will need text-only instructions. I tried going to github-releases, but I cannot find any download link for mozregression-gui.exe. I tried googling for that file and cannot find a download link. Is there a direct link to download mozregression-gui.exe for windows 11?

I may have seen some slowdowns with Firefox 131.0.1, but it has really become almost unusable with 131.0.2.

Flags: needinfo?(arnold.trembley)

Link to mozregression: https://github.com/mozilla/mozregression/releases/download/6.2.2/mozregression-gui-signed.exe

Your crash is linked to bug 1919678, which has been fixed on the latest Nightly. Could you also test if your issue has been fixed in the latest Nightly? (https://download.mozilla.org/?product=firefox-nightly-stub&os=win&lang=en-US)

Crash Signature: [@ neqo_common::codec::Encoder::encode_uint<T> ]
Flags: needinfo?(arnold.trembley)
See Also: → 1919678

Looks like your have Avast antivirus installed on your machine. This makes it very likely that your bug is fixed on the latest Nightly. Bug 1919678 is exactly about this issue. Please check and let us know!

I finally managed to find mozregression-gui.exe and install it, but it crashed. I think it wants me to shutdown my active browser session in order to test my profile, but I can't shut down my firefox session and keep the bug ticket and email open.

If it makes any difference, I tried stopping Avast anti-virus. That might have helped with the youtube viewing problem. When I try to play youtube videos, they stop every 10 to 30 seconds, and you have to wait up to 30 seconds for playback to resume. But then it will stop again.

I tried reading all those related bug tickets, but I don't understand what neqo is. I do use Avast AV, but when I use the most current Librewolf portable browser with Avast, I don't have the problems AT ALL. Pages load quickly and I don't see any pauses in Youtube. Librewolf is a fork or clone of Firefox, why would it work better than Firefox?

I could try disabling Avast completely, but then I would need to enable MSE or Defender (whatever they call it). I will try that and report back.

How would I best be able to test the nightly? Firefox says I am on the most current version.

Flags: needinfo?(arnold.trembley)

You dont need to disable Avast. A temporary fix has been deployed within Firefox Nightly.

To try Firefox Nightly, go to https://www.mozilla.org/en-US/firefox/channel/desktop/ , scroll down to "Nightly" and download the installer.

Flags: needinfo?(arnold.trembley)

I tried searching the Avast forums but apparently I need to create an account different from my Avast account. It appears that an Avast user reported a problem on October 10, 2024, with youtube playbacks halting in Firefox 131.0.2. He found that disabling Avast resolved the problem.

But why would the problem exist in Firefox 131.0.2 but NOT in LibreWolf 131.0.2-1 built from the same source code base???

Flags: needinfo?(arnold.trembley)
Attached file Firefox 131.0.2 crash —

This time the browser was only up 706 seconds. When I tried to open Sourceforge.net, it crashed.

I didn't have much luck with the 133 nightly preview. I could not direct it to my normal profile, that prevented me from logging in to gmail and youtube. I tried youtube anyway. It was slow to load but no video halting or pauses. Some websites are still very slow to load. Again, LibreWolf Portable loads webpages much faster, so it doesn't appear to have the problem.

Nightly version will differ in terms of performance from the release version.
If you want to confirm if the issue has been fixed with your old profile, you can either try firefox sync or try the steps mentioned here.

Since the crash no longer occurs in the nightly build, we can reasonably conclude that the issue has been resolved, and it is unlikely to be related to your profile.
However, please inform us if you experience any further crashes with your old profile on the nightly build

Flags: needinfo?(arnold.trembley)

The bug has a crash signature, thus the bug will be considered confirmed.

Status: UNCONFIRMED → NEW
Ever confirmed: true

I have upgraded to Firefox 131.0.3, and the problem with crashes playing youtube videos is resolved, but Firefox is still loading websites very slowly (Amazon, Youtube, Sourceforge), and when youtube videos play, the video resolution is very poor (looks fuzzy). Windows 11 won't run Defender unless Avast is uninstalled, and I prefer Avast (when everything is working right). I can disable Avast and then Firefox works normally, but then I have no realtime protection.

And still, LibreWolf portable version 131.0.2-1 using Avast doesn't have problems loading those websites. So I am seriously thinking about switching to LibreWolf portable, since it seems to work so much better and I could have antivirus protection.

Flags: needinfo?(arnold.trembley)

Thanks for the confirmation that the crashes are fixed by 131.0.3. We believe that LibreWolf is not affected by Avast because Avast isn't proxying connections for LibreWolf -- i.e. it isn't providing the protection it claims to provide for LibreWolf. Avast causes performance issues due to the proxying (I presume from your report). Since they don't work much with browser vendors, it's hard to know what they're doing or why, or to fix what they're doing that causes perf issues. Chrome blocks H3 proxies entirely due to previous bugs where antivirus/Avast proxied H3 and caused things to break. We may consider doing the same thing (but note it also bypasses whatever protection Avast is claiming to add)

You could open a new bug about Performance Problems when using Avast with Firefox.

Thanks!

Status: NEW → RESOLVED
Closed: 1 year ago
Resolution: --- → FIXED

Thanks very much! That was very informative. Because of your note, I've been reading up on HTTP/3 and QUIC in Wikipedia. I have noted this in an Avast forum, but I still haven't figured out how to file an official Avast bug report with them. But I did learn that disabling Avast's "Web Shield" solves the problem (all other Avast shields can remain active).

I might consider opening a new bug about performance problems when using Avast with Firefox, but hopefully Avast can be nudged to figure out what they're doing wrong.

Thanks again for all your help!

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