Rated 5 out of 5 stars
Xmarks works perfect for me with Firefox 5! It's always been my favorite for bookmarks synchronization. I tried using the new Firefox Sync, but it really sucks for bookmarks. It kept overwriting my desktop with netbook bookmarks. Firefox Sync has few if any options.
Xmarks gives me all the options I need. I just synced between two computers. Works like a dream :)