I've never had to use this myself (all the addons I want are already in addons.mozilla.org), but I've heard that it works pretty well in the past. (Interestingl

I've never had to use this myself (all the addons I want are already in addons.mozilla.org), but I've heard that it works pretty well in the past. (Interestingly, there are a bunch of reviews claiming the auto-download feature doesn't work anymore, so you might have to use something like http://crxextractor.com/first http://crxextractor.com/first).