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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!

firefox doesnt start and gives me this error If i uninstall the have a fresh, install, everything will work normally until i restart my pc

AvailablePageFile: 13664788480 AvailablePhysicalMemory: 20233519104 AvailableVirtualMemory: 138533665595392 BackgroundTaskMode: 0 BuildID: 20260116091309 CPUMicrocodeVersion: 0xa50000d CrashTime: 1769253421 HeadlessMode: 0 InstallTime: 1768730212 LastStartupWasCrash: 1 ModuleSignatureInfo: {"Mozilla Corporation":["firefox.exe","xul.dll","gkcodecs.dll","nss3.dll","mozglue.dll","lgpllibs.dll"],"Microsoft Windows Software Compatibility Publisher":["msvcp140.dll","VCRUNTIME140.dll","VCRUNTIME140_1.dll"],"Microsoft Windows":["wsock32.dll","DWrite.dll","textinputframework.dll","dbgcore.dll","dbghelp.dll","version.dll","CoreUIComponents.dll","CoreMessaging.dll","ktmw32.dll","WinTypes.dll","propsys.dll","uxtheme.dll","dwmapi.dll","kernel.appcore.dll","windows.storage.dll","ntmarta.dll","CRYPTBASE.dll","wldp.dll","ntasn1.dll","ncrypt.dll","msasn1.dll","profapi.dll","KERNELBASE.dll","ucrtbase.dll","bcryptPrimitives.dll","gdi32full.dll","win32u.dll","bcrypt.dll","msvcp_win.dll","wintrust.dll","cfgmgr32.dll","crypt32.dll","user32.dll","oleaut32.dll","shlwapi.dll","advapi32.dll","msvcrt.dll","imm32.dll","ole32.dll","rpcrt4.dll","shell32.dll","kernel32.dll","SHCore.dll","ws2_32.dll","gdi32.dll","sechost.dll","psapi.dll","combase.dll","msctf.dll","ntdll.dll"]} ProductID: {ec8030f7-c20a-464f-9b0e-13a3a9e97384} ProductName: Firefox ReleaseChannel: release SafeMode: 0 SecondsSinceLastCrash: 899 StartupCacheValid: 0 StartupCrash: 1 StartupTime: 1769253421 SubmittedFrom: Client SystemMemoryUsePercentage: 40 Throttleable: 1 TotalPageFile: 37688152064 TotalPhysicalMemory: 34198491136 TotalVirtualMemory: 140737488224256 UptimeTS: .1135774 Vendor: Mozilla Version: 147.0.1 Ce rapport contient également des informations techniques sur l’état de l’application lors du plantage.

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

Hello I had Mozilla Firefox as my default browser on my Mac laptop

I got a message this morning that Firefox could not open

I tried several times but no luck

I read through some of the online HELP sites and deleted the Firefox app and reloaded it

I also cleared the browsing history on SAFARI and CHROME although I couldn't see why that would work

Still not able to get FIREFOX to open