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Trying to update to 37.x always results in msg mozilla.exe not found?

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Received a message saying an update was available, which I allowed to proceed. It looked to be working for a minute or two, the issued an error message saying mozilla.exe was not available. Every time after this when trying to start Firefox I get the same message. Plus at the same time I get a message from Norton saying it is resolving a security issue with SUSPICIOUSCLOUD9.B. To recover I had to regress back to 36.x. Then I tried the update again, with the same results, so I went back to 36.x, turned off automatic updates and deleted the maintenance updater that is installed with Firefox. Don't know where to go from here.

Vybrané riešenie

If you get a pop-up message asking to update Firefox or plugins or scanning for malware then such a message is likely a scam and you should never respond to such an alert to avoid getting infected with malware.

  • Only update Firefox via "Help > About" or by downloading and installing Firefox from the Mozilla server and never via a pop-up or link on a web page.
  • Plugins should only be updated via the plugin itself or by visiting the home page of the plugin.

You can find the full version of the current current Firefox release (37.0.1) in all languages and all operating systems here:

You can do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

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

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.


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Vybrané riešenie

If you get a pop-up message asking to update Firefox or plugins or scanning for malware then such a message is likely a scam and you should never respond to such an alert to avoid getting infected with malware.

  • Only update Firefox via "Help > About" or by downloading and installing Firefox from the Mozilla server and never via a pop-up or link on a web page.
  • Plugins should only be updated via the plugin itself or by visiting the home page of the plugin.

You can find the full version of the current current Firefox release (37.0.1) in all languages and all operating systems here:

You can do a clean reinstall and delete the Firefox program folder before (re)installing a fresh copy of the current Firefox release.

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

  • (32 bit Windows) "C:\Program Files\Mozilla Firefox\"
  • (64 bit Windows) "C:\Program Files (x86)\Mozilla Firefox\"

Your bookmarks and other personal data are stored in the Firefox profile folder and won't be affected by an uninstall and (re)install, but make sure NOT to remove personal data when you uninstall Firefox as that will remove all Firefox profile folders and you lose your personal data.