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unable to start firefox

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Hello!

For the last few days my Firefox browser is unable to start. I have tried reinstalling it, turning off antivirus/firewall and cleaning up the registry but it is still the same results every time.

When looking into the event viewer this is what it says:

Faulting application name: firefox.exe, version: 71.0.0.7275, time stamp: 0x5de4f320 Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000 Exception code: 0xc0000005 Fault offset: 0x00007ff9134c012a Faulting process id: 0x2c10 Faulting application start time: 0x01d5ab45c9a82230 Faulting application path: C:\Program Files\Mozilla Firefox\firefox.exe Faulting module path: unknown Report Id: faf0ebdb-aa0c-4fd3-890c-f15dd9482c76 Faulting package full name:

When started it briefly shows up in the task manager but quickly vanishes and I am unable to start it in any way, even in safe mode.

Appreciate any help concerning this matter! /Jenny

Chosen solution

hi, the symptoms sound very similar to https://bugzilla.mozilla.org/show_bug.cgi?id=1590430 - did you ever use comdo security products in the past or even if not, could you check if there's a file called IseGuard64.dll, IseGuard32.dll or similar located under C:\Windows\system32\ or your system drive?

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Chosen Solution

hi, the symptoms sound very similar to https://bugzilla.mozilla.org/show_bug.cgi?id=1590430 - did you ever use comdo security products in the past or even if not, could you check if there's a file called IseGuard64.dll, IseGuard32.dll or similar located under C:\Windows\system32\ or your system drive?

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Thank you!

That file was indeed present in the system folder despite this computer never having installed anything related to Comodo as far as I know.

I read that topic before but since I hadn't ever installed Comodo on this device I didn't look further into it.

Firefox works again now, so thanks for your help!