Ever since upgrading to FF4 the addon-manager is whacked and freezing when I click the extensions tab. I had to disable otherwise stable extensions because of this and it's getting to the point where I have to decide to use a different browser. Why is this happening and don't say it's the extensions, these are well tested and they are good it's firefox that is broken. I tried to created a new profile from scratch but after adding a few addons it froze again, what the heck is going on ? This is frustrating. It's not like I'm adding unknown extensions, there are popular and long time working addons that have been updated for FF4.