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).
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.
LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.
The quickest way to find out if your computer is infected!
Bitdefender QuickScan is a very fast antivirus scanner, able to determine in a matter of seconds if a system is infected with malware.
More on http://quickscan.bitdefender.com/faq
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.
The One; The Original Fasterfox Gives performance & network tweaks for Firefox. Fasterfox makes your browsing so much faster!
Make your Sites Faster than a Fox with Fasterfox for FireFox!
Save time by speeding up repetitive tasks. Get faster, parallelized downloads, see definitions, auto-load the next page, improve searching, and more. FastestFox will dramatically enhance your productivity!
Tweak Network will speed up the loading of web pages and increase the maximum number of simultaneous downloads from a site.
Make your browsing experience faster by avoiding wait time on DNS lookups
This plugin allows you to check any file you are about to download, any page you are about to visit with online version of Dr.Web anti-virus.
A Statusbar with speed, percentage, time and loaded size (similar to Opera's one)
Easy translation tool using Google Translate. Select text and right click to translate. Press CTRL+SHIFT+L to open translation window.