These aren't necessarily my favorites but they are addons I used to have installed and may do so again in the future or maybe they seem interesting to me and I'll try them out some time.
19 828 625 gebruikers
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).
4 579 202 gebruikers
The easy way to download and convert Web videos from hundreds of YouTube-like sites.
1 108 707 gebruikers
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. 4K download
2 281 631 gebruikers
404 368 gebruikers
It has never been simplier to download videos from Youtube, Dailymotion and from most of the video streaming site.
Just play the video, click on the toolbar, download and play it immediately in our integrated video player.
943 624 gebruikers
An extension that adds direct links to download YouTube videos as MP4 and FLV. It has a simple interface and it downloads videos directly from YouTube. The extension integrates with YouTube's interface and adds a download button below the player.
1 341 764 gebruikers
The first and only download manager/accelerator built inside Firefox!
1 225 261 gebruikers
2 120 257 gebruikers
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.
1 176 479 gebruikers
Adblock Plus Pop-up Addon extends the blocking functionality of Adblock Plus to those annoying pop-up windows that open on mouse clicks and other user actions.
1 025 750 gebruikers
Find out which websites you can trust. WOT adds intuitive traffic light-style icons next to search results and URLs to help you make informed decisions about whether to visit a site or not.
327 355 gebruikers
LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.
670 703 gebruikers
Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Orkut, and many, many other sites. You can even customize Firefox and other programs themselves.
732 052 gebruikers
Fight the text ads! Element Hiding Helper is a companion extension for Adblock Plus meant to make creating element hiding rules easier.