Disable Compatibility checking in Firefox 3.6

In Previous releases of Firefox you can use 

extensions.checkCompatibility to disable the addons compatibility checking

but from FF 3.6 onwards this is replaced with new key

extensions.checkCompatibility.<Version>

where <Version>is <Number>.<Number><Letter>

FF 3.6 -> extensions.checkCompatibility.3.6

FF 3.7 Beta 1 -> extensions.checkCompatibility.3.7b