Firefox 4 Beta 1: Installing Non Compatible Extensions

If you need to install extensions which are not compatible with Firefox 4 Beta 1 you need to make the following changes:

• open page about:config
• right-click anywhere on page and select New -> Boolean
• Enter preference name as extensions.checkCompatibility.4.0b
• click OK
• enter value as False
• click OK

You should now be able to install extension compatible with older version of Firefox, even though many will not work.

WARNING: Adding extension which are not compatible with Firefox 4 Beta 1 could break you Firefox Install and you will probably not get any support from the developers.