Google Browser Sync For FireFox (Link)

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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.

This extension works with Firefox version 1.5 and later. Currently, it doesn't work in the Mozilla Suite, Internet Explorer, or Opera. Google Browser Sync is compatible with all operating systems supported by Firefox 1.5.

Google Browser Sync keeps all your browsers in sync with each other, so it needs to send potentially sensitive information like your stored passwords, bookmarks, and browser history to the other computers where you've installed it. Also, once you install Browser Sync, you don't need to log in every time you start the browser to access this info. Therefore, someone who uses a computer where you've installed browser sync will have access to all the info you've chosen to sync across your computers. Any new browser settings they create, such as browsing history, will also show up on your other computers.

Talking about trusting your private data with Google ... hmmmm ....

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Google Browser Sync
Google Gives FireFox Sync Tool (PC Pro)