Now that Firefox has entered in the Rapid release mode, I'm wondering at the implications on add-on compatibility front.
For example, will a working FF4 add-on (in my case, Firebug) still work after the upgrade to FF5?
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Firebug 1.7.3 works for me - just upgraded to FF5 with no problems.
Whilst I agree with @slhck 's comment, my gut feeling would be that given Mozilla's rapid release intentions, I think changes to FF would be minimal and incremental so maybe add-ons would be less likely to be broken.