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firefox.exe - Entry Point Not Found

  • 1 reply
  • 53 have this problem
  • Last reply by cor-el

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FireFox 10, crashed and can't open. Tried uninstalling and reinstalling. I get this error message when trying to open; "The procedure entry point ?IsWrapper@js@@YA_NPBUJSObject@@@Z could not be located in the dynamic link library mozjs.dll".

Any ideas?

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Do a clean (re)install and delete the Firefox program folder (C:\Program Files\Mozilla Firefox\).

Download a fresh Firefox copy and save the file to the desktop.

Uninstall your current Firefox version, if possible.

  • Do NOT remove personal data when you uninstall the current version or you lose your bookmarks and other data because all profile folders will be removed.

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

Your bookmarks and other profile data are stored elsewhere in the Firefox Profile Folder and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.