Today marks the nine-year anniversary of Mozilla releasing its first-ever public web browser: Firefox (Phoenix) 0.1. And while the web client has seen great success in its near-decade run, it's lately been losing ground to the new kid on the block, Google Chrome. Sure, Mozilla's market share, along with a portion of its user base, has been heavily encroached upon, and several analysts have Google's web browser taking the No.1 spot by mid/late 2012. But while skeptics are quick to write off the open-source browser, they neglect Mozilla's true saving grace: its robust and innovative extensions. So in celebration of its longevity in the web game, Complex has complied a set of the most popular and innovative add-ons. Before you head over to Mozilla's Add-Ons site, preview the 15 Best Firefox Extensions to Download Right Now.