Disable Firefox Add-on Compatibility Checking

By on November 19, 2011.     What do you think of this article?

This article is updated for Firefox 28.

In an article I wrote last April concerning the Firefox 4 add-on compatibility checker, I explained how to quickly disable said tool in order to allow older add-ons to run. That tutorial worked great for Firefox versions 4-7, but it has to be updated for Firefox 8. In this tutorial, I’ll walk through removing the old configuration and adding the new.

  • 1.) Open up Firefox’s Configuration page by typing about:config in the address bar. Read the prompt and click the button saying you’ll be careful. (See how to re-enable that warning prompt)
  • 2.) Inside the filter field, enter in extensions.check to shorten the list of preferences
  • 3.) Right-click the extensions.checkCompatibility.4.0 preference and choose the Reset option. You will notice the Type changes from a boolean (True/False) to a string and the Value goes blank.
  • 4.) Create a New > Boolean with a preference name extensions.checkCompatibility.28.0 and set the boolean value to False.
  • 5.) Restart Firefox and your new preference will function just as it did for Firefox 4-27. The old preference you reset also disappeared from the Configuration page because it was an empty value.

Notice: Starting with FF 8, the old Preference needs to be removed and a new Preference with the proper major version number needs to be added each time Firefox updates. If Firefox goes from version 28 to 28.0.1, no change; if it goes to 28.1 or 29.0, you need to apply the change.

Posted in: Web Browsers



is the site owner of Computer Tech Tips and is passionate about computer technology, particularly Windows-based software, malware removal, and web development. He enjoys helping people troubleshoot computer problems and providing technical support to family, friends, and people around the net. Xps wrote 78 article(s) for Computer Tech Tips.


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