[nffc]

Originally Posted by Masque

That does not enable the addons and nor does Nightly Tester Tools, below is the about:config link.

http://www.blogsdna.com/6522/how-to-...ox-browser.htm

Yes it does.

Go into about:config, then create a new boolean, call it "extensions.checkCompatibility.4.0" and set it to false.

Restart firefox and the compatibility check will be off BUT that might mean any addons which genuinely don't work will probably break firefox unless they are manually disabled. That said most of them do work even if they said they don't.