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When I start firefox 12 it gives two errors; First one saying mozutils.dll is missing and firefox needs to be installed. Second mozjs.dll not found in system.

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I downloaded and copied the mozutils.dll and mozjs.dll in the system32 folder and the first error message stopped. But the second error message persists.

The second error message says that no entry point found...... could not be located in the dynamic link library mozjs.dll

I did a clean install of firefox but still the same error.

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DON'T PLAY WITH SYSTEM32 folder. You can get your Windows Corrupted.

You will need to Reinstall Firefox because your previous Installation did not end properly or it got Corrupted.

-> Uninstall your current Firefox as described in this article -> Uninstall Firefox from your computer

  • DO NOT SELECT TO REMOVE USER DATA AND SETTINGS
  • Restart your system

-> Download latest Firefox version from the following link using some other Web Browser:

-> Install Firefox 12 as described in this article -> How to install Firefox on Windows

Check and tell if its working.