Firefox Community Forum

Using the browser Firefox when Claude is answering questions every 3-4 responses will hang and the response will consume up to 98% of the cpu as well as 600 to 700 MB of memory. The only recovery is to kill the tab. The CPU is : Intel(R) Core(TM) Ultra 9 185H 3.10 GHz With 64GB ram Using Firefox version 139.0.1 I had Claude switch to only respond with plain text and the issue continued. The issue also occurred during a discussion with Claude about this issue which confirmed it was a Firefox-specific problem with Claude's interface. It during his response, it's likely related to the real-time text streaming or DOM updates.

I'm looking for a solution to an annoying bug in Firefox on Windows 11. The taskbar won't hide when I go into fullscreen on videos (e.g. YouTube).

The issue is directly tied to hardware acceleration.

This doesn't happen in Chrome, and I've already tried reinstalling Firefox and updating all my drivers and Windows. Does anyone know of a fix for this bug?

My C hard drive is almost full. How can I get Firefox to run from the D drive? I tried copying the files there but it would not run. Do I need to edit something in the Registry? I'm using (for as long as I can) Win 10 on a Dell desktop. Latest version of Firefox is installed.

Thanks for any assistance.

Hello all, I have the same exact problem described in post https://support.mozilla.org/en-US/questions/1463436, dated 9 December 2024. Until ten days ago (more or less) all was working correctly. At the beginning I thought there was a problem with Intesa because Intesa had problems in all the country in that period, but I have now tried CHROME and found that is working correctly. My system uses Firefox 139.0.1, W10-32 and Iliad FTTH. I have already cleaned cache and data from settings but the problem remains. Any thought? Thanks very much for any help. Mario.

Why won't Firefox open any new windows? I give ir the command to open a window and yet all i get are tabs and I never click on open a tab. I have an HP probook this for windows 10 and i am also having the same problem with Chrome. I have uninstalled and reinstalled chrome and that did not fix it so it is not that. What would cause this? I have already cleared the cache cookies history browsing etc. and nothing is fixing it. PLEASE HELP.

Suddenly yesterday privacy badger popup and disabled my youtube channels..I disabled privacy badger but of no use..I cannot enter youtube channel..wtf is going on..Firefox just decided to enter this badger and throw my off entering youtube?? Pls send us what to do to fix it or we must disable and delete firefox from being my browser alltogether??

I am repeatedly getting this pop up window after starting my computer and selecting the Firefox icon in the toolbar to start the browser. When using the Firefox browser I always update Firefox when prompted, so it should be the latest version, unlike what it states in the popup window. If I want to use the browser, I have to sign in to the browser and sync my data and I have to re load all my tabs from my history. It is time consuming to the point where my colleagues who were using Firefox have uninstalled Firefox and are now using a different browser. I could do the same...but I want a solution. I'm using Windows 11.

Whenever I close Firefox and try to reopen it, it brings up a system error that says, "The code execution cannot proceed because C:\WINDOWS\system32\pmls64.dll was not found. Reinstalling the program may fix this problem." I've tried completely deleting Firefox and reinstalling and it opens a new tab, but when I close it i get the same error message.

Firefox keeps randomly crashing and won't open, sometimes I can get 10 minutes before it returns to crashing all over again. Doesn't even OPEN troubleshoot mode, it just auto crashes.

My drivers are up to date, my windows are up to date, Firefox is up to date, Internet Security software is up to date.

I need this running ASAP for work, each crash report has a different code too which hurts.

First crash happened in the afternoon, yesterday. bp-6580ff2f-d79c-4472-89f6-542c60250604 4/06/2025, 5:15 pm

The rest are all today. bp-79fddad8-e05d-4376-884f-f81670250604 5/06/2025, 2:05 am bp-d3e94b00-0c80-4db1-94e0-9c1410250604 5/06/2025, 2:05 am bp-9191a616-31cc-44e0-83a0-5e0d20250604 5/06/2025, 2:05 am bp-18adbdcb-ea8a-44cd-b4a0-18c4e0250604 5/06/2025, 2:05 am bp-f27c149e-2355-4632-8d0e-28fcc0250604 5/06/2025, 2:05 am bp-cfc523e7-c87f-42ac-bd2e-ddea90250604 5/06/2025, 2:05 am bp-bcee28d7-140f-4ad2-846c-308750250604 5/06/2025, 2:05 am bp-500792c2-0995-4a9e-8e87-600ad0250604 5/06/2025, 2:07 am

I'm running Firefox 139.0.1 on Mac Sonoma 14.7.1.

Since FF V138, I've had this extremely frustrating problem where, approximately once a day and while the application is still running, Firefox seems to either auto-revert to an older version' 'or otherwise mess up the installation files. I don't get any notice this is happening until I try to open a new tab and it brings up the "You must restart Firefox" notice. When I click Restart, it pops up with "You've launched an older version of Firefox, so you won't keep any of your bookmarks because that would be unstable" error.

The only way I've found to fix it is to redownload the most recent install files, which, after the fresh install, will allow me to keep using Firefox with my bookmarks for the next 5-6 hours, before the whole process starts again.

I theoretically have auto-updates off; my settings are set to the other option, "Check for updates but let you choose to install them". Doesn't seem to make a difference. It only does this on my Mac; the FF install on my Windows machine works fine.

I really want to keep using FF. It's my preferred personal browser. But this is really messing with me! I was hopeful that 139.1 would fix it but same issue, so far.

I had an issue with the hidden task bar not showing up when I moved my cuser to the bottom of the screen, so I was "playing around" and messed it up. I created another profile, but lost all my bookmarks and so forth. I copied files from my old profile to the new profile, but now I can't get to michaels.com - it won't load. Also, I have my yahoo mail tab looks like it's loading, but I got in my email and when I went to blackforrest.com it does the same thing.

I still have the issue of my task bar not "unhidding" when I go to the bottom of the screen. I have to minimize my screens to see the task bar.

Can you help, please?

Hello, My Mozilla browser has been displaying new websites in black and white for two years or more (NYT, SMH, NZ Herald, Gdn - see screenshot attached). Substack, random theatre co, Airlines, conferences etc etc everything else appears in colour!

I am not great on tech so I have looked at Settings and asked google and got nowhere. Thanks people for any advice - It will be appreciated.

(PS seriously Mozilla help please do not offer those asking for help a manual troubleshooter link without stating it will wipe their help request when they use it. This is just mean of you).

Hi, Re Firefox browser how do you get back 2 windows with tabs that disappeared when restarting the PC. They are not in history anymore at all, they are gone. What opened up instead after the restart, was 2 lots of Windows & tabs that just disappeared in the same way, from 3 years ago, & they reappeared on the browsers. Can you tell me what is going on please & how to fix this problem in losing them in the first place? This problem has happened several times before & is very upsetting. Can you help in finding my recent loss of windows/tabs please? Regards Doug

bold text It is not possible to watch videos in 1080p since the moment I installed the latest update. I have to reduce to 720 or 480 to get smooth motion. Running Windows 10. How can I fix this?

Sometimes, when I try to watch a youtube video, it will not play and sometimes while the video plays, it suddenly turns green and my RAM usage climbs to 100% I cannot refresh the page and have to restart Firefox, but it can still happen again. My graphics drivers are also up to date, so I'm not sure what the issue is.

Once I visit any web site that uses HTTPS there is approximately a 90% chance it'll take seconds or even minutes to secure the connection. This never happens on other browsers as they load such pages instantaneously.

I already cleaned my data up and removed the extensions, both suspected and innocent bystanders, to no avail.

As stated in the title, I'm using Firefox 139.0.1 x64 on Windows 11 (24H2, build 26100.4061). This started happening after an automatic Firefox update, I never changed anything in my system configuration.