Firefox will not open at all, after the last update (13.08.2015).

After the update (40.0.2 @ 13.08.2015) just used Firefox open. The process is visible in the Task Manager, but does nothing. no window. JUST. NOTHING. It works only in safe mode or when ran as administrator. I tried other computers from home too. Same thing.

How to fix?


Try a clean reinstall and delete the program folder before Firefox to (re) install a new copy of the current version of Firefox.

If possible to uninstall your current version of Firefox to clean the Windows registry and settings in the security software.

  • Do NOT remove the "personal data" when you uninstall your current version of Firefox, because this will remove all profile folders and you lose personal data such as bookmarks and passwords including data profiles created by other versions of Firefox.

Delete the program folder Firefox before installing newly downloaded copy of the Firefox installer.

  • (32-bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (Windows 64 bit) "C:\Program Files (x 86) \Mozilla.

Your bookmarks and other personal data are stored in the Firefox profile folder and will not be affected by a uninstall and (re) install, but do NOT delete personal data when you uninstall Firefox which removes all Firefox profile folders and you lose your data.

Tags: Firefox

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