After upgrading my Firefox browser to the latest version all of my Add-ons had disappeared! Well, they still appeared in the Tools > Add-ons menu but had no effect on the browser functionality. For example, I use Tab Mix Plus yet Firefox showed the standard tab bar without the extra features that TMB offers.
How to Fix Your Firefox Add-ons That Are Not Working
There’s a few steps involved in this, mainly depending on which operating system you’re using.
- Close Mozilla Firefox if open
- Find your Mozilla Firefox profile folder (details below)
- Delete these 3 files:
extensions.ini
extensions.cache
extensions.rdf - Open Mozilla Firefox and it will automatically recreate these files
Find Your Mozilla Firefox Profile Folder on Windows 95, 98, and M
Profile folders are in one of these locations, by default:
- C:\Windows\Application Data\Mozilla\Firefox\Profiles\<profile folder>
- C:\Windows\Profiles\<Windows login/user name>\Application Data\Mozilla\Firefox\Profiles\<profile folder>
Find Your Mozilla Firefox Profile Folder on Windows 2000, Windows XP, Windows Vista, and Windows 7
- %APPDATA%\Mozilla\Firefox\Profiles\<profile folder>
Find Your Mozilla Firefox Profile Folder on Linux
- ~/.mozilla/firefox/<profile folder>
Find Your Mozilla Firefox Profile Folder on Mac
You can find your profile in 1 of these spots (~ stands for the current user’s Home folder):
- ~/Library/Mozilla/Firefox/Profiles/<profile folder>
- ~/Library/Application Support/Firefox/Profiles/<profile folder>
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