Firefox 4 with sync integrated
Mozilla’s Weave Syncing tool, which syncs your personal data across multiple PCs and mobile devices, is now official part of the Firefox 4 roadmap. Mozilla Weave Sync is still add-on but it will be integrated into browser and renamed to Firefox Sync. This is long awaiting tool because it will make really easy to keep your bookmarks, history, open tabs and other personal Firefox dada synced between multiple computers and mobile devices. There is also announced app for syncing Firefox with iPhone.
If you cannot wait for Firefox 4 integrated sync release and want to sync your data immediately, you can download Firefox Sync addon from here and follow the easy to config and setup instructions for easily syncing your data.