More than 3 billion downloads have been downloaded by Firefox users since add-ons have been made officially available in November, 2004. It took Mozilla 49 months to reach the first billion; the second billion took only 20 months and the third billion arrived after 24 months.
Mozilla said that 85 percent of Firefox users have at least on add-on installed. The most popular remain AdBlock Plus, Firebug, NoScript, Personas Plus and Video DownloadHelper, which are part of a add-on base that includes more than 150,000 add-ons from more than 25,000 developers in total.
The average Firefox user has five add-ons installed. The most popular add-on categories are privacy and security, search, bookmarks and themes. What do you have installed in your Firefox?