
For all you multi-computer users, try Mozilla's new "Weave" service. It uploads all your bookmarks, your history, your passwords and all that to the Weave server, so when you fire up your other computers it can download them again and keep them all in sync. Just like Google Browser Sync used to do, but that one is no longer maintained. And Weave is only in the early stages of development, could go anywhere. Sharing extensions, search engines etc.
http://services.mozilla.org/