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Since Windows Insider build 21318 (we need Insiders build for some WSL features), after a few minutes of usage characters start to disappear from the application : pages, menus, etc. Only Firefox triggers this behavior, but once it has started it propagates to other Windows apps. The only solution is to quit Firefox and any affected app and relaunch. Firefox is pretty much unusable at this point.

This bug is very much alike the one reported here : https://support.mozilla.org/fr/questions/1313520

Restarting in safe mode doesn't change behavior : not related to hardware acceleration or add-ons.

Tested with Firefox v87.0 and Nightly. I also checked the described behavior also happens on co-workers computers same model/same configuration (this is on a Dell laptop Precision 7550 with an NVidia Quadro RTX4000).

Firefox keeps going unresponsive after 10 to 30 minutes. I tried creating a new places thing. It didn't work, and oddly still let me restore my old session and kept my bookmarks, which it said I'd have to re-install. I'm only running two extensions, U-block and NoScript. It will go Unresponsive, remain so far minutes at a time, briefly return and then immediately go unresponsive again, just long enough for me to close a tab or shut down. Nothing I have done seems to fix this. I am on the latest Windows 10, Desktop, latest Firefox.

I recently updated to Thunderbird version 78.8.1 (32-bit) on my Windows 10 machine and it crashes at random. I was previously using version 60.9.1 without issue. The crash reports indicate that xul.dll is the culprit. There are several entries--in red--that indicate xul.dll only, so I'm assuming that this is the issue. Any idea how to address this?

I have multiple (IMAP) email accounts on my TB profile from various hosts including IONOS, Hostgator, A2, and Google. I didn't have any issues when I was using an older version of Thunderbird but now the crashing is persistent. This is happening at both work and home; I'm using the same email profile for both. It's also happening for other users at my company who have recently upgraded. Different A/V for home/work PCs so not sure that this is the issue.

Using the following add-ons: Manage Emails (Nostalgy++), Manually sort folders, Provider for Google Calendar, Quickfolders, and Remove Duplicate Messages. Tried to restart with add-ons disabled and was still crashing.

Any help would be greatly appreciated. Thanks.

hello there and good evening:3 my husband and i are having this repetitive and extremely frequent bright yellow pop up with a robot that states "a webpage might be slowing down your browser." then the option to wait, or stop it. i've ran out of patience with this notification to the point to where even though i'de hate to, i would have no choice but to switch back to chrome just to stop being spammed by this pop up while im trying to relax. it happens more frequently on youtube and walmart.com, and i just want it to stop because it seems as if when it does show up, once it starts it never stops, and it actually slows down my webpage to the point of becoming unresponsive and stalling/crashing my only webpage open at the time. my husband has the same issue and we both use windows desktop. it only started appearing after the latest update. please, can someone help me make this thing go away? its very stressful and i cant browse in peace anymore on firefox. yes we have turned off all background processes, and we both have scowered settings troubleshooting for hours at a time to no avail, it just never stops and it behaving like a really bad bug.

I can not press the "Backspace" on YouTube using Firefox, but my keyboard works fine cause in Chrome and Edge it works perfectly, I've already refreshed the tab and still not working. Have any idea of what's going on?

I'm trying to better understand why a certain website I frequent online seems broken or something with the level of tracking protection I have enabled with the main page working fine then the stories pages being spread out or something rather than what it was supposed to be like if this helps. I'm not able to read the story easily and have to scroll down over and over again and sometimes, the webpage won't allow me to go down on the page as well. I'm not too sure if that's because of the tracking protection level I have enabled and how to get around this if so rather than having to go back to the standard level. Feel free to share your thoughts sometime. Thank you in advance if you reply to this.

My problem is pretty well defined in the Subject line. For years I have been so contented with Thunderbird -- its display, its options, etc. About 6 months ago it started doing this thing where when shut down and later reopened, it comes up with a different display than I had been using and all tabs which were open were now closed and "lost" (not to be found under "recently closed tabs"). This is really distressing since I often leave a tab open like leaving a (physical) letter on my (physical) desk to remind me that I need to gather information and reply to it. Once my Thunderbird tabs are closed and no where to be found, I have no way of recollecting what follow-up business I need to complete. Please help. I'm running on Windows 10.

Hi,

I'm hoping you might be able to help. Thunderbird periodically won't send or receive emails from a Gmail account. The other accounts that are on Thunderbird (4 business ones and a yahoo one) always work fine. I get the message:

"Message could not be sent because the connection to Outgoing server (SMTP) smtp.gmail.com timed out."

In addition, it also fails to save drafts, and gives me this message:

"Your draft message was not copied to your drafts folder (Drafts) due to network or file access errors. You can retry or save the draft locally to Local Folders/Drafts-xxx@gmail.com."

The issue only happens periodically, but can last for several hours before it corrects itself and a flood of emails are them received! I've attached a screenshot of the

My ISP is Now TV Broadband My firewall is the one supplied with Windows 10 My antivirus is AVG Antivirus Free version 21.2.3170 (build 21.1.5968.646) My OS is Windows 10 My Thunderbird version is 78.9.0 (64-bit)

I tried reinstalling Thunderbird but it made no difference.

If you can give me any help I'd really appreciate it.

Regards,

Matthew

After installing the Native MathML extension (to get MathML typeset equations on the Wikipedia, as suggested on mediawiki.org), all equations set by MathJax/MathML turned to using STIX instead of Latin Modern. I'd like them to stick to Latin Modern instead.

The only possibly related setting I've found is `font.name-list.serif.x-math` in about:config, whose value is `Latin Modern Math, STIX Two Math, […]`. I tried to manually change the font family specification of some text to see if Firefox could use Latin Modern Math to begin with, but apparently it can't (see first screenshot attached), while it loads STIX allright (second screenshot). Latin Modern is not the first locally installed typeface I haven't been able to use, but it's the first one I have really tried to (I don't remember which one the other typeface was).

My Latin Modern font comes from TeX Live 2019 installed using the TUG installer, not Fedora's package manager. `fc-list | grep -i "latin modern math"` returns `/usr/local/texlive/2019/texmf-dist/fonts/opentype/public/lm-math/latinmodern-math.otf: Latin Modern Math:style=Regular`. I'm running Firefox 87 on Fedora 33.

We keep getting "Not responding" error that appears to be worsening - more frequently & longer duration. Happened at least 3 times since starting this submittal. Running Windows 10 with all current updates on Dell XPS w/ Core i7 8th gen. Have tried the fixes found online.

Thanks for your help.

Hi,

I had to delete all my profiles and completely reinstall Firefox because Firefox was not changing the color of previous websites to purple no matter what I tried. I thought I could delete the profiles and create a brand new one to start over fresh.

After reinstalling Firefox (latest version) I have run into a problem where under <about:addons> <Plugins> it shows a yellow box and an error saying "Widevine Content Decryption Module provided by Google Inc. will be installed shortly".

This message won't go away and Widevine will not be installed at all. I cannot browse and Netflix, Hulu, HBO Max etc.

I have tried unchecking and checking the <Play DRM-controlled content> under <about:preferences> which does not work.

I have also tried going to this (link)link and manually installing it but the webpage for my OS's .zip file won't load for me.

You can work around the issue by stopping the video currently playing in the YouTube tab before navigating away from its page.

I suspected the usual problem of hardware acceleration / video drivers and Firefox not playing nice, but thanks to the PortableApps.com Firefox builds and their version archive, I was able to confirm that it only happens on Release 86 and newer.

Since it's reproducible with the PortableApps builds, settings/profile/cookies etc., it seems pretty clear it's an issue with Firefox proper.

I've downgraded my main Firefox installation to 85.0.2 for the time being and am enjoying snappy YouTube without hangs again.

Anybody happen to know if that bug is already known / under triage or should I get comfortable with the idea of having to downgrade to and using Firefox ESR for a while?

Whenever I click the Firefox browser icon, it will start up, and then close a second later. I have tried reinstalling the program, yet this doesn’t fix the problem. I saw a crash report the last time that it worked and ignored it. Is there a way to bring it back up? I tried to do it myself while running it as an administrator, but that didn’t work either.

Hello!

My Firefox stopped working this evening and I can't figure out why. When I open it, it shows a tiny, blank window for a fraction of a second and does nothing. I did some digging and this is what I found.

- Firefox Safe Mode doesn't start - Profile Manager doesn't work - Opera has the same problem - Restarting my computer didn't work - Reinstalling didn't work - Restarting and Reinstalling didn't work - I don't have CCleaner so that's not an issue - I went into my OSDrive to hunt and delete every folder labelled Mozilla I could find and that didn't change anything on reinstallation - The link I used to download the installer is: https://www.mozilla.org/en-US/firefox/new/

Any suggestions? I saw a forum post that suggested a faulty value somewhere in the Windows Registry (http://kb.mozillazine.org/Browser_will_not_start_up#No_Mozilla_applications_will_start), but the link it cites doesn't work anymore and I would prefer not to go Registry diving if I don't have to. Thanks and let me know if you need anything else.

When copying an image from another program, such as Snagit or powerpoint into gmail using firefox, I get two identical copies of the image.

When copying formatted text from Powerpoint to gmail, the text also shows up twice -- once with the formatting, and once without the special formatting.

However, when copying text from Word to gmail, the text only shows up once -- with the formatting.

This does not happen with Chrome.

It does not happen when copying the image or text into another microsoft program like word. It only happens in Firefox.

I have refreshed Firefox, disabled add-ins, and cleared cache. Nothing helps.

Please advise on how to stop this from happening when copying an image or formatted text.

This problem has only started in the last couple of weeks. I am using Firefox Version 87.0 Build ID 20210318103112

with Windows 10.

While browsing https://www.mathrubhumi.com/ site, a warning will come "A webpage is slowing down your browser, what would do like to do, stop it or wait" Then system monitor shows a web content is consuming around 4.5 GB and firefox itself stopped the webpage. If the memory usage is higher the system will hang.

Upon loading any website that uses my Webcam or Microphone, Firefox crashes, and crashes immediately upon reloading Firefox and the associated website.

Examples include: Roll20, Spelltable.

I do now the series of events that lead to the crash but not the reason why it crashes.

I guess my Firefox recently updated and instead of the login saving system that's worked perfectly for years, we have to replace it with a bad app that doesn't work. Firefox Lockwise refuses to save any logins that I put into it. It keeps saying that I need to put in a primary password. Fine, so I go to the settings and try to set up a primary password. No dice, it just tells me that I'm unable to without telling me why. So now I'm left with a formerly incredibly useful part of Firefox that's just completely vestigial now in the name of some nebulous concept of progress.