There are thousands of Firefox add-ons. Did we test them all? Nope! But, these 12 are the ones you need to make the most of your Web browsing.
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Flash cookies, otherwise known as Local Shared Objects, represent one of many privacy threats online. Get rid of them with BetterPrivacy. You can also get rid of them using software like Flush, but why not prevent them from being installed in the first place?