Yeah, it's great. for the most part, but it actually seems a bit slower @ loading pages than FF 2 (at least, for me); and what happened to the "Sort By Name" option on the Bookmarks right-click menu?
Also, as for my extensions, the "Remove 'Bookmark Toolbar Folder' from the Bookmarks menu" option in UI Tweaker no longer works, and neither do the following 'hide' (X) options in Menu Editor: