I've got a folder of downloaded extensions, and you can install them from your hard drive without problems.
All you should need to do is double click the downloaded .xpi file, if no "Software Installation" box in Firefox pops up, right click on the file, click "Open With..." and choose Firefox (if it's not in the inital list you will have to click Browse, go to its installation directory, and choose firefox.exe).
What version of Firefox are you using?
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To alcohol! The cause of, and solution to, all of life’s problems
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