I think this is perhaps the best addon for Firefox, Mozilla should integrate this into their core system. Xmark is a free bookmark manage, a web based bookmark organizer to be exact. Xmarks will sync across most browsers such as Firefox, Internet Explorer, and Safari (Mac OS). It is also able to sync between a computer and mobile smartphone, making it the most accessable online bookmark ever.
This is a very useful software for those using different computer at home and in the office. Install it on all your computers to keep your bookmarks and (optionally) passwords backed up and synchronized. Xmarks provides seamless bookmark synchronization between your computers and browsers via our synchronization server. Your bookmark (and optionally password) data is securely stored and backed up on our servers.
