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I really want to remove FF4 and go back to FF3, how can all old settings be reclaimed?

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  • 6 have this problem
  • Last reply by TonyE

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After looking around the web no guidance for my question has been found yet. Is there a Mozilla method to roll back?


The FF4 Sad Faced "Submit Feedback" page has the "submit button greyed out, thus no sad faced feedback is accepted. Or maybe it just isn't acceptable?

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To downgrade to Firefox 3.6 first uninstall Firefox 4, but do not select the option to "Remove my Firefox personal data". If you select that option it will delete your bookmarks, passwords and other user data.

You can then install the latest version of Firefox 3.6 available from - it will automatically use your current bookmarks, passwords etc.

To avoid possible problems with downgrading, I recommend going to your profile folder and deleting the following files if they exist - extensions.cache, extensions.rdf, extensions.ini, extensions.sqlite and localstore.rdf. Deleting these files will force Firefox to rebuild the list of installed extensions, checking their compatibility, and reset toolbar customizations.

For details of how to find your profile folder see

What problems are you having with Firefox 4?