Paul has a link to Firefox 2 Release Candidate 1 here.

I’ve been using the beta for a week or so and love a number of the improvements. But RC1 broke the add-in I use for posting to del.icio.us (it was working in Beta1 amazingly).

But here is the fix for incompatible add-ins - if your favorite one is not compatible, this fix will probably make it so. It was actually quite simple.