Adblock Plus by Wladimir Palant
Ever been annoyed by all those ads and banners on the internet that often take longer to download than everything else on the page? Install Adblock Plus now and get rid of them. For a quick overview watch http://www.youtube.com/watch?v=oNvb2SjVjjI
FlashGot by Giorgio Maone
Download all the links, movies and audio clips of a page at the maximum speed with a single click, using the most popular, lightweight and reliable external download managers.
Video DownloadHelper by mig
The easy way to download and convert Web videos from hundreds of YouTube-like sites. This works also for audio and picture galleries
NoScript by Giorgio Maone
The best security you can get in a web browser! Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.
DownThemAll! by Federico Parodi, Nils Maier, Stefano Verna
The first and only download manager/accelerator built inside Firefox!
Greasemonkey by Anthony Lieuallen, Aaron Boodman, Johan Sundström
Personas for Firefox by Mozilla Labs
Personas are free, easy-to-install “skins” for Firefox that make changing the look of the browser as easy as changing your shirt. With Personas, you can individualize your browser with hundreds of artist-created designs or create …
Firebug by Joe Hewitt, Rob Campbell
AnyColor by pavlost
Change Firefox to Any Color and create your own personalized theme.
Download Statusbar by Devon Jensen
View and manage downloads from a tidy statusbar – without the download window getting in the way of your web browsing.