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.
https://addons.mozilla.org/en-US/firefox/addon/2109
https://addons.mozilla.org/en-US/firefox/addon/2109
