Translation, text-to-speech, transliteration on pages and in the pop-up for 100+ languages.
Pearltrees lets you organize all your interests.
Duplicate Tabs Closer Featured
Detects and automatically closes duplicate tabs.
Google™ Translator Lite Featured
a powerful tool to translate words or sentences
Clear Console Requires Restart Featured
One click to clear your cache, cookies, history, html5/local storage, http logins, all of them or restart your browser with/without notifications.
User-Agent Switcher Featured
Quickly and easily switch between popular user-agent strings.
Classic Toolbar Buttons Featured
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.
Beta builds on versions page!
YouTube™ Flash-HTML5 Featured
Play YouTube™ Videos in Flash or HTML5 Player
Beyond Australis Featured
Australis was the code name for the current Firefox theme, it aimed to make a great browser look awesome. Now you can go one step further and also make it feel awesome to use!
QuickJava Requires Restart Featured
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.
Google search link fix Featured
This extension prevents Google and Yandex search pages from modifying search result links when you click them. This is useful when copying links but it also helps privacy by preventing the search engines from recording your clicks.
Bring your bookmarks into view with just a gesture. Move the sidebar across the screen. Open a different sidebar by just clicking its title. And more! Keeps your sidebar simple and quick to access!
Point & click to forbid/allow any class of requests made by your browser. Use it to block scripts, iframes, ads, facebook, etc.
Weather Underground (Forecast Plus) Featured
Provides local & long range Weather Forecast using Weather Underground
Increase your browsing privacy, protection, and speed.
Tab Scope Requires Restart Featured
Preview and navigate tab contents through popup.
Private Tab Featured
Adds private tabs.
This add-on brings back the ability to change the page which is shown when opening a new tab.