Firefox Community Forum

I’m suddenly unable to open Mozilla Firefox at all on my Windows 11 Pro (version 25H2) Surface Laptop. The browser never launches - every attempt immediately crashes and opens the Firefox Crash Reporter.

I tried uninstalling and reinstalling a fresh copy of Firefox (and removing the old application files, though the original Firefox program folder has 13 .tmp files inside a “tobedeleted” folder that I can’t delete), but the issue persists. When I try to install or uninstall Firefox, I get the same behavior: Firefox never opens, and I end up with multiple instances of the Crash Reporter popping up instantly.

Tried renaming firefox.exe as well to no avail. Chrome and Edge are working fine.

Hello! Thank you for taking the request!

My firefox browser crashes repeatedly at startup, only showing the crash report window instead of opening the browser. When starting the browser using troubleshoot mode, it crashes too, showing the same result. After uninstalling and re-enstalling the latest version, the exact same problem continues.

I've scanned for viruses and checked the computer RAM and neither seems to be the problem.

The latest submitted crash report ID is bp-0917ab7e-e656-42ff-aa92-40b8c0251112

I'm really grateful for your help, and looking forward to your reply!

CCleaner automatic upgrade to "ccleaner 7" killed Firefox! No other changes to the SW or machine. This computer works great every day. Fully up to date with Microsoft. The "upgrade" that I did not ask for, lost my license and switched me to the "free version of CCleaner. I uninstalled it and started over from CCleaner website. Worked fine with old version. It upgraded itself again and now Firefox is dead. Microsoft Edge does open. I never use this. Thanks

This is the message that pops up when I try to open Firefox: [Window Title] C:\Users\Kurt\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Firefox.lnk

[Content] Windows cannot find 'C:\Users\Kurt\AppData\Roaming\Microsoft\Internet Explorer\Quick Launch\User Pinned\TaskBar\Firefox.lnk'. Make sure you typed the name correctly, and then try again.

[OK]

When I open Firefox in Windows 11 a small window appears that reads, "Firefox Couldn't load XPCOM. I have not found any solutions to stop this that work. Will Mozilla fix this?

In my org - ever since the release of Firefox 146 - each time an update is rolled out on a WIndows 11 endpoint - Firefox is no longer able to launch.

This is resolved by uninstalling and reinstalling the client. We've had no issues with the ESR release in my testing.

What changed? Anyone else experiencing this?

I had our security team take a look at the antivirus - they've confirmed we aren't blocking Firefox and they did not see any block reports.

No relevant policy changes have gone through around the time of the incident. Initially I suspected users were installing Firefox ESR from the Company Portal alongside the standard release - but confirmed this is not the case. Also ruled out browser extensions - error persisted across a config without any extensions.

Please let me know if there is troubleshooting info I can collect. I included info from my own browser, but I reinstalled on the 27th and it has been working since. However, it has broke specifically on the days new releases have come out.

Thank you for any suggestions!

Dell installed a command update and immediately afterwards, Firefox would no longer open, either from the taskbar icon or from settings/apps. I just get a couple of seconds of the blue cycle icon and then nothing, no error message, just nothing. I did download/install repeatedly but I don't get beyond the download screen - as soon as it's 100% downloaded, that's it, no welcome window, nothing. Thanks

Version: Mozilla Firefox for Linux 149.0 Device: Termux v. 0.119.0-beta.3 Output: IceWM 4.0.0 + XServer XSDL v. 1.20.53 Log: ``` $ firefox --no-remote --alsa-output-device=default --display=:0 console.error: "Warning: unrecognized command line flag" "-alsa-output-device" Exiting due to channel error. Exiting due to channel error. Crash Annotation GraphicsCriticalError: |[C0] [GFX1-]: CompositorBridgeChild receives IPC close with reason=AbnormalShutdown (t=1.68679) Segmentation fault firefox --no-remote --alsa-output-device=default --display=:0 $ echo $? 130 ``` Reinstall tried. Refresh tried. Malware checked - none. Trouble Shooting mode log: ``` $ firefox --safe-mode Exiting due to channel error. Exiting due to channel error. Exiting due to channel error. Exiting due to channel error. Exiting due to channel error. Segmentation fault firefox --safe-mode $ echo $? 139 ``` Without tags start ``` $ firefox Exiting due to channel error. Exiting due to channel error. Bus error firefox $ echo $? 135 ``` Sometimes it can be started but not stable Maybe the problem is: problem with about:sessionrestore, everytime I open it, I can see about:sessionrestore page for short, and when it can start up (sometimes in troubleshooting mode), after choose a option, browser crash, and if I open another tag and close it, browser runs as normal.

since 3 days, after initiation of the Firefox the empty page appears with order to close firefox. A have reinstalled the new version several times withour anu change in the program behaviour

I have looked over this computer high and low for any profile files in every way recommended on this website. I can't find it, regardless of what I put into terminal or what settings I change. This was a problem before the update to tahoe too.