Is it possible to download a Firefox add-on to my computer?
How do I go about doing that?
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With the FEBE extension you can export a xpi file for all your installed addons, so you can just install it normally.
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.