How to Force Install Incompatible Addons in Firefox

Step-by-Step Guide

1. 1

   Step 1: Navigate to Help->About Firefox.

   Make note of the version number listed here, you will need it later on.
   
   In this example, it is Firefox 22 (22.0).
2. 2

   Step 2: Navigate to the Firefox preferences editor.

   You can do this by typing "about:config" in the address bar and hitting Enter.
   
   You will be prompted with a warning about being careful.
   
   Click "I'll be careful, I promise!". , To do this, right click in the body of the preferences.
   
   A menu will be displayed.
   
   Click New->Boolean.
   
   A boolean value just means one that is either true or false.
   
   Note:
   If this key already exists, you can right-click on it and click "Toggle" so that it says "false" under "Value". , This follows the format of "extensions.checkCompatibility" followed by the version number.
   
   In Firefox 6, for example, the preference name would be "extensions.checkCompatibility.6.0".
   
   Enter it and click OK. , This will disable the Firefox compatibility checking. ,
3. 3

   Step 3: Create a new key.

4. 4

   Step 4: Enter the preference name.

5. 5

   Step 5: Select 'false' in the list box to set this setting to false.

6. 6

   Step 6: Restart Firefox for the changes to take effect.

Detailed Guide

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