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Firefox does not start

  • 8 replies
  • 1 has this problem
  • 19 views
  • Last reply by AliceWyman

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After a new clean installation Firefox will not start. It generates a crash report in C:\ProgramData\Microsoft\Windows\WER\ReportArchive

AppCrash_firefox.exe_2dd4e427a29c7793432f8b232e348d43fa3ccf_b5a654c8_3fe69cd3-6f6e-4ee6-892f-f849836f0392

Can you help me to get Firefox starting?

All Replies (8)

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We're sorry to hear that your Firefox seems to be crashing when you open it. Please perform the following steps to give us a crash report ID that helps us find out more about the cause of the crash.

  1. On the keyboard, press [Windows] Windows key + [R]. This should bring up a Run window that contains a text field.
  2. In that text field, type %APPDATA% and press Enter. An explorer window should open.
  3. From that explorer window, double-click on the Mozilla folder, then double-click on Firefox and then on Crash reports. Double-click on submitted.
  4. Now, you should see a list of files that contain reports. Go to View > Arrange Icons by > Modified to get the most recent files at the top of the window.
  5. Open the most recent 5 files with a text editor and copy the IDs.
  6. Paste each ID with bp- into the reply window on the forums.

Thanks in advance!

You can find more information and troubleshooting steps in the Troubleshoot Firefox crashes (closing or quitting unexpectedly) article.

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Thank you Seburo, but this does not solve my problem.

After typing %APPDATA% my computer goes to C:\Users\Giovanni\AppData\Roaming In the folder Mozilla are 2 folders: Extensions and SystemExtensionsDev Both folders are empty. Now what?

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I do not succeed in finding the profile manager. I have installed Firefox several times now, in vain. it does not work. HP lapto EliteBook 8730w Windows 10 Pro Intell Core 2 Duo Cpu P8600 @ 2.40Ghz memory 4.00Gb 32 - bits, x64 processor

Firefox does not start

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You can check for issues caused by a corrupted or incomplete Visual C++ installation that is missing runtime components (Redistributable Packages) required by Firefox, especially VCRUNTIME140_1.dll.

Install both 32-bit and 64-bit "Visual Studio 2015, 2017 and 2019" downloads, (x86: vc_redist.x86.exe and x64: vc_redist.x64.exe) from https://support.microsoft.com/help/2977003/the-latest-supported-visual-c-downloads

You may not need the latter (32-bit version) if you use 64-bit Firefox. You may have to reboot the computer. ++++++++++++++++++++++++++++++++++++++++++++++ In another thread, a user reported that a recent update of Malwarebytes Anti-Exploit (version 415) may be causing symptoms similar to the VC Runtime problem. If you have MBAE, it should have a setting to exempt Firefox. You could test whether that makes any difference.

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cor-el said

See also:

This article only goes up to Windows 7. Are the later Windows compatible? (8, 10, 11)

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Maybe something here will help? Firefox won't start - find solutions - under No error message Bug 1602341 - Firefox APPCRASH

Modified by AliceWyman

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