Following are some of my favourite firefox add-ons 1. DoNotTrackMe Protect your privacy. Stop companies and advertisers from tracking your browsing and sending you spam email. 2. AdBlock Plus Blocks annoying video ads on YouTube, Facebook ads, banners and much more. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable). 3. BugMeNot Tired of creating multiple accounts on various websites, bypass compulsory web registration with the context menu via www.bugmenot.com. 4. DownThemAll The first and only download manager/accelerator built inside Firefox! 5. Flash Video Downloader Flash Video Downloader helps you to download any video (flv, mp4, HD) from YouTube-like, Facebook, Break, Metacafe and more in one click. You can download mp3, music (iPod), avi and more. Download Flash games. Download Helper.