I think some of the add-ins I had on FireFox 3.6 and which managed to get added to FF4 might not have been thoroughly tested for compatibility issues.
Will remove unnecessary ones.
Your friends over here at WebAssist! These Dreamweaver extensions will assist you in building unlimited, custom websites.
These out-of-the-box solutions provide you proven, tested applications that can be up and running now. Build a store, a gallery, or a web-based email solution.