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.
Never be annoyed by a Flash animation again! Blocks Flash so it won't get in your way, but if you want to see it, just click on...
Personas are free, easy-to-install "skins" for Firefox. Personas Plus extends that built-in functionality to give you even more control and easier access to new, popular, and your own favorite Personas.
Fasterfox Gives performance & network tweaks for Firefox. Fasterfox makes your browsing much faster!
Image Block adds a toggle button that conditionally blocks/allows loading of images on webpages. Blocking images results in faster browsing, especially helpful on handheld devices or slower connections like GSM/GPRS/EDGE dial-up etc.
The extension previously known as GooglePreview. Inserts preview images (thumbnails) and popularity ranks of web sites into the Google, Yahoo, Bing and DuckDuckGo search results pages.
Secure Login is an extension for Firefox integrated password manager.
Tweak Network will speed up the loading of web pages and increase the maximum number of simultaneous downloads from a site.
Note from Mozilla: This add-on has been discontinued. Try Video DownloadHelper instead.
Download YouTube - The best YouTube video and music downloader for Firefox.
If you aren't concerned about someone looking over your shoulder and stealing your passwords, why hassle with those obfuscated password fields, where you never know whether you typed your 30 character code correctly or not...
Click a button or hit the hot-key to maximize (almost) any Flash content to the entire browser window. You can then enjoy your favorite games in any size you like, simply by resizing the browser window. Now with less bugs and more features...
TryAgain keeps trying to load a webpage when the server cannot be reached.
This add-on will fix many web pages that don't show up correctly. It extracts MS Office-exported html (Office Web Components), and fixes many "Internet Explorer only" pages and other web annoyances. For example, you can use this addon to turn symbol ...