Firefox Sync coming to Firefox 4

As expected, the latest Firefox 4 nightlies feature Firefox Sync, Mozilla’s service that lets you synchronize your bookmarks, tabs, history, passwords, preferences, and other customizations among devices that support Sync: Firefox for desktops, for Maemo devices, and Firefox Home on the iPhone.

Just like the original Firefox Sync extension, its preferences are integrated with Firefox own options and is only noticeable by a small icon in the status bar.