When firefox gets updated some of the extensions gets disabled. The reason for that is that Firefox extensions need to define in what version of Firefox they work. But in many cases extensions authors don’t update their extension version, or it takes some time after a new version of Firefox is introduced until a new version of the extension is out.

Firefox by default disables extensions that do not match the version, although thet can still work without problems.

Fortunately you can still make these extensions work with a new version of Firefox, by using this simple hack.

• In the address bar type about:config
• In the Filter line type: app.extensions.version
• Now you should have a single line in the preferences saying app.extensions.version. If it does not exist just right click on the empty list and select New->String to create one
• Now double click the value and set the value to the previous version of Firefox. In our case set it to 1.5 (from 1.5.0.1).
• Restart Firefox
• Open the extensions and find the disabled extensions. Right click on the disabled extension and select Enable.
• Restart Firefox

Note this is just a temporary solution and some extensions might crash Firefox - so be careful with this solution.

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