Best

2 billion downloads

Firefox reached the one billion add-on downloads mark in early 2009. As for 2010, Firefox users have collectively downloaded more than two billion add-ons. Following are the popular consumer and developer add-ons chosen by the Firefox Add-ons Community and by the editors of AMO for the 2B Firefox Add-on Download milestone. Here are the best of the best top 25 Firefox Add-ons chosen ever.

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