Firefox disable plugin compatibility check

To disable the plugin compatibility check for Firefox 3.6 follow these steps:

1. Open Firefox
2. In the address bar type “about:config”
3. On the page click I’ll be careful, I promise!
   
4. Right click and select new –> Boolean
5. Enter the preference name: extensions.checkCompatibility.3.6 and press OK
6. Select False and press OK

Now you can install plugins that aren’t compatible anymore (but might still work).