Google Browser Sync!

Firefox’s major asset is its wide variety of user community created and supported extensions.

The ability the save all open windows and active tabs was a “cannot live without” feature brought forth, in part by Tab Mix Plus. Firefox 2 now incorporates similar functionality.

Google, being Google, has upped the ante with “Google Browser Sync for Firefox ":https://addons.mozilla.org/addon.php?id=1122. (Verbatim) 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.

A valuable extension to save session feature between computers, such as those users who use a desktop and laptop, or Windows machine and Mac OS machine.