Quote Originally Posted by attis View Post
I'm still stuck with FF 3.6.16 because there still isn't an update for CacheViewer. Looks like the developer is no longer actively working on the addon. It's such a great tool and make my works so much easier.
There is a tool on Mozilla that turns off compatibility checker, so you can install any extension, I'm using 4 with all my old addon's most work, only come across one that doesn't work 100% so far.