Source: http://www.google.com/tools/firefox/...ync/index.html

Google Browser Sync for Firefox is an extension that continuously synchronizes your browser settings – including bookmarks, history, persistent cookies, and saved passwords – across your computers. It also allows you to restore open tabs and windows across different machines and browser sessions
Google has released a tool that will save all your Firefox bookmarks and settings on a little server it has at its head office.

This extension will continuously synchronise your browser settings, including bookmarks, history, persistent cookies, and saved passwords, across your computers.

It also means that when you open Fireferret it will restore open tabs and windows across different machines and browser sessions.

Google says that the data is encrypted onto your Gmail account and will not be shared. Of course, the tin-foil hat wearers among us wonder how long it will be before a government agency demands that Google hands over the data...