Google Browser Sync is a Firefox extension that synchronizes your cookies, passwords, bookmarks, history, and tabs across any number of computers with the extension installed.  I've found it extremely useful for being logged into a website while I'm at work and still being logged into the website when I get home (depending on whether or not the website keeps logins active or the user has to login with each new session).  It's also useful to type something into the address bar at home and have it autocompleted with a website I saw while at work.  Very useful plugin.  I'm a fan. #technology