When I click on firefox a message pops up saying "' error: platform version 40.0.3 is not compatible with minVersion > = 38.0.5 maxVersion < = 38.0.5" how to fix it? "

This is an image of what appears when I click on Firefox

This usually happens because of a Firefox update failure that left you with a mixture of old and update files in the Firefox program folder.

Do 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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