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Summary - Firefox crashes repeatedly. yesterday, I decided to switch to Firefox after using Chrome for a while. it worked fine and I synced my data from Chrome. today, at some point I noticed Firefox is no longer open in my taskbar. I decided to reopen it - it crashed. since that moment it has never worked again. I tried launching it in safe mode (firefox.exe -safe-mode), didn't work. tried reinstalling it, didn't work. manually deleted the files from C:\Program Files and AppData, installed Firefox again, didn't work. reinstalled gpu drivers, didn't work. sfc /scannow-ed, you guessed it - still crashes. what else could I possibly try? please help.

os: Windows 11 Home Firefox source: https://www.mozilla.org/en-US/firefox/all/desktop-release/win64/

p.s. this was posted through an android phone but the problem only occurs on windows

Hello! I've been seeing some strange behavior on firefox launch or on new profile launch. There is a popup during startup, can't see it on the screen but I can see it in tray. Is this normal or no? I observed it on two different hp notebooks so far.

After update to 140.0.2, clicking on Firefox icon in the dock does nothing. The title bar says Firefox is active, but nothing shows on my screen. What changed? Did you reset something in my preferences?

Hello! I am an avid user of firefox (especially with adblockers) on a windows 11 PC. Unfortunately, I have recently been experiencing an issue where when I attempt to open firefox, a window will open for a split second before instantly closing again. My PC is up to date, I have tried refreshing firefox and doing a clean install, but cannot seem to overcome the issue, or even open it in safe mode. Does anyone have any advice? Many thanks in advance!

I keep getting a message that Firefox is running but it’s not in my task manager.

I can’t uninstall it without closing it but I can’t close it while it’s running.

I've powered off and on and I've done everything I read online to do but keep going in circles.

I downloaded firefox and it worked for about a month. Now when I try to launch it, the screen flashes momentarily as though it were about to pop up, but then it does not actually open a browser window. I have uninstalled and reinstalled firefox more than once, I've tried a simple restart of the computer, and tried multiple different update methods (updated windows). Any suggestions?

When I try to launch firefox, it opens only on the taskbar for a split second and doesn't launch. I don't see the program appear at all on task manager. I've restarted my computer and reinstalled multiple times. This problem persist across multiple computers

Firefox refuses to open. What happens is, It'll open for like 1 frame and then close. This happened to Chrome last month too, which is actually why I installed Firefox. I have to uninstall it, then reinstall it from the website. If that doesn't work, I try the Microsoft Store. If that doesn't work either, I keep switching between them until it eventually opens. It breaks again when I turn off my computer. Thanks.

Hello,

I have the latest version (140) of Firefox installed on a Windows 11 laptop with the latest Windows updates. It works fine for my user (who, BTW, has admin privileges) but it won't even start for my wife's Windows user. To be precise, "won't start" means that when you try to launch it it sometimes looks like it's trying to create a window but immediately closes it with no error messages, no crash reports, no logs, nothing at all. It won't even start from the Run menu with any command line flag like -p, -ProfileManager or even -safe-mode, I tried all of them.

Other things I've tried: 1) Check the Windows event logs. Nothing. 2) Run sfc /scannow to check for corrupt system files. 3) Uninstall Firefox, delete the Program Files\Mozilla Firefox folder, and re-install it. 4) Move the entire Firefox folder inside %appdata% to a temporary folder outside users. Firefox recreates it, creates 2 new profiles and dies silently again! 5) ...and a lot of other things that I read online and do not remember anymore.

At this point I'm at a loss and I'm an IT guy. Of course I have no idea how this happened, the browser used to work fine up until a week ago or so. Other software that might interfere is Malwarebytes, but it works fine for my user, so... 🤷🏻‍♂️

Thanks in advance for any ideas.

Hi, The browser suddenly closed, and I can't open it since then. I searched for what to do but couldn't find anything helpful. I tried reinstalling Firefox, but it still doesn't work. I don't know it is a helpful information, but the other browsers (like Chrome and Opera) also don't open.