FEBE (Firefox Environment Backup Extension) allows you to quickly and easily backup your Firefox extensions. In fact, it goes beyond just backing up -- It will actually rebuild your extensions individually into installable .xpi files. Now you can easily synchronize your office and home browsers.
Not perfect, but the best multiple-session-in-one-browser solution I know of: "CookieSwap is a Firefox/Mozilla extension that enables you to maintain numerous sets or "profiles" of cookies that you can quickly swap between while browsing."
Have you ever been interested in what extensions are available for Firebug? If yes, take a look at what I have found. Frankly, I was quite surprised how many Firebug extensions already exists out there.
Linkwad lets you save and restore tabbed browsing sessions called wads. Wads can be shared and accessed from any computer. You can also share your "wads".
I've never gotten along too well with the Mozex plugin that should allow me to edit Firefox textareas in TextMate. Fortunately, a new plugin seems to make things a lot easier...
How It Works TrackMeNot runs in Firefox as a low-priority background process that periodically issues randomized search-queries to popular search engines, e.g., AOL, Yahoo!, Google, and MSN. It hides users' actual search trails in a cloud of 'ghost' quer