Add-on(s) Disabled by Firefox

I am anticipating some users may end up accidentally breaking their extensions trying to go back to Firefox 3.6 after trying out Firefox 4.0. The method below also solves pretty much any add-ons installation issues.

Firefox will automatically disable any extension that is not compatible with build you are running. This will happen if you try to go back to an older (Firefox 3.6) version after already running the same profile in a newer version (4.0) of Firefox. However, even after you return to the correct version of Firefox, it will not automatically re-enable the disabled add-ons for you. The good news is you shouldn’t have to go through and reinstall all your extensions. In order to re-enabled your add-ons follow these directions:

  1. Close Firefox
  2. Locate your profile folder
  3. Delete the following files from your profile folder and restart Firefox:
    • extensions.ini
    • extensions.cache
    • extensions.rdf

Firefox will rebuild your extensions and themes list and these files. Your extension should be re-enabled and functioning again after the restart.

2 Comments on Add-on(s) Disabled by Firefox

  1. Thanks for the info. I’ll more than likely wait for the dust to settle before I try out 4.0!

  2. Thanks for this information first! I am one of the person get caught by this. But I think during this process it just uninstalls add on and says it is not compatible with Firefox 3.6 and I need to reinstall those add ons again when I switch to Firefox 4. Should try your solution!!!!!

3 Trackbacks & Pingbacks

  1. Installing Firefox 4. | Firefox Extension Guru's Blog
  2. Firefox 4 Released | Firefox Extension Guru's Blog
  3. Add-ons Disabled – Updated for Gecko 2.0 | Firefox Extension Guru's Blog

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