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Firefox Extension Backup Extension (FEBE)

FEBE 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.

I just came across this earlier today and I must say, if you’re a Firefox user than this needs to be installed. It’s nice to have a backup, but it’s also nice to be able to copy extensions across several computers if you want to keep your work computer, laptop, and home computers synced (for example).