As Mark Finkle says so well, disabling add-ons compatibility checks does not magically make your extensions compatible.
Disabling this check for anything other than participating in add-ons testing and development is not a good thing. You risk your browser stability, and potentially your computer's security. Just don't do it.
If you're not an add-on developer or tester and you can't use Firefox without your favorite extensions, just wait it out for a few more weeks until we can get the final release out. It's not worth the instability and other very real problems that do result from truly incompatible extensions.
Thanks for your patience.
