googleブラウザ・シンク

firefoxのエクステンションであるgoogleブラウザ・シンクは異なるマシンでfirefoxのブラウザ設定を同期することが出来る。

These sorts of frustrations inspired us to build a Firefox extension that keeps your browser settings for all your computers in sync. Google Browser Sync unifies your bookmarks, history, saved passwords, and persistent cookies across all the computers where you install it. It also remembers which tabs and windows you had open when you last closed any of your browsers and gives you a chance to reopen them. We think you'll enjoy how it handles sync conflicts and "just works," enabling you to bring your browser with you everywhere.

http://googleblog.blogspot.com/2006/06/get-in-sync.html
http://www.google.com/tools/firefox/browsersync/index.html