Most Popular Extensions
Adblock Plus Featured
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 easy way to download and convert Web videos from hundreds of YouTube-like sites.
Easy Screenshot Requires Restart
Capture a screenshot of the whole webpage, and save in your desktop in default.
NoScript Security Suite Requires Restart Featured
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.
uBlock Origin Featured
Finally, an efficient blocker. Easy on CPU and memory.
Increase your browsing privacy, protection, and speed.
The first and only download manager/accelerator built inside Firefox!
Greasemonkey Requires Restart Featured
Download YouTube Videos as MP4 Featured
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.
Flash Video Downloader - YouTube HD Download [4K] Requires Restart
Flash Video Downloader helps you download any video (flv, mp4, HD) from YouTube, Facebook, Break, Metacafe and more in one click. You can download mp3, music (iPod), avi and more. Download Flash games. Download Helper. 4K download.
Web of Trust, MyWOT/WOT: Website Reputation Rating Requires Restart Featured
Find out which websites you can trust. WOT adds intuitive traffic light-style icons next to search results and URLs so you can decide whether to visit a site:
• Green – The site is trusted
• Yellow – Be cautious
• Red – Online threats detected
This Add-on sets your default Search to Yahoo, and it brings a fresh look to every new tab page, powered by Yahoo.
Tab Mix Plus Requires Restart Featured
Tab Mix Plus enhances Firefox's tab browsing capabilities. It includes such features as duplicating tabs, controlling tab focus, tab clicking options, undo closed tabs and windows, plus much more. It also includes a full-featured session manager.
Google Translator for Firefox Requires Restart Featured
With this addon you can translate any text to your own language with one click or hot-key. You can either translate the selected text, this way the translated text will overwrite the original selected text, or you can translate the full page too.
FlashGot Mass Downloader Requires Restart Featured
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.
LastPass Password Manager Requires Restart
LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.
This Add-on gives you a simplified version of Yahoo Toolbar along with Flickr images on every new tab. It also provides quick access to your top sites.