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.
This works also for audio and picture galleries.
Protect your privacy. See who's tracking your web browsing and block them with Ghostery.
The first and only download manager/accelerator built inside Firefox!
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.
Remove or manage a new and uncommon kind of cookies, better known as LSO's.The BetterPrivacy safeguard offers various ways to handle Flash-cookies set by Google, YouTube, Ebay and others...
Latest updates: See bottom link 'version history'!
BlockSite is an extension, which automagically blocks websites of your choice. Additionally, this extension will disable all hyperlinks to these websites, by just displaying the link text without the clicking functionality.
Make any pages' search functionality available in the Search Bar (or "search box")...
Display all Google services as buttons or as a space-saving dropdown menu next to your address bar. Reach services like Gmail, Google reader, Google maps, Google calendar, and many more in a single click from your browser.
A full-featured scientific calculator which can be placed in any Firefox tool-bar or the Australis PanelUI.
Add-on for Firefox that gives you a super-fast way to to open your favorite sites using keyboard shortcuts. Pressing Ctrl + Space invokes the 'Launcher' followed by a single key press to open a specific site. Example: open Facebook by Ctrl+Space, F.
Note from Mozilla: This add-on has been discontinued. Try Add-on Update Checker instead.
Notifies you when updates are available for your extensions and themes.