The world first knew it as Weave Sync, but Mozilla has moved Firefox's in-house synchronization project out of its Labs, calling it Firefox Sync to emphasize its connection to the browser and hint at its importance for the future.
The upcoming Firefox 4 will have the add-on's syncing features baked in, but why wait? Download the add-on and check out how Firefox Sync matches up your preferences, bookmarks, passwords, history, and open tabs in this How To video.