After Firefox autoupdated to 3.6.15, all my toolbars are gone even though they're still listed as enabled under Add-Ons. They don't appear under View > Toolbars, and I even tried to uninstall and reinstall them, but they still don't appear.
In particular, StumbleUpon and Web Developer are gone. >< When I click on Options under Stumble's Add-On, the window just freezes...
In particular, StumbleUpon and Web Developer are gone. >< When I click on Options under Stumble's Add-On, the window just freezes...
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There may be a problem with one of the files that stores details on installed extensions. Try deleting the files as shown in the "Corrupt extension files" section of this link - https://support.mozilla.com/kb/Unable+to+install+add-ons
If one of the files listed is corrupt it can cause problems with extensions not working even if they appear to be installed.