The first addon you should be installing on a fresh Firefox install. A must have. The most beautiful yet the simplest add-on that makes a strong colorful appeal. Colors every tab in a different color.
FoxyProxy Standard Featured
FoxyProxy is an advanced proxy management tool that completely replaces Firefox's limited proxying capabilities. For a simpler tool and less advanced configuration options, please use FoxyProxy Basic.
Classic Toolbar Buttons No Restart 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 on Windows.
Beta builds on versions page!
NoScript Security Suite 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.
Screengrab (fix version) Featured
Screengrab! saves webpages as images.
New features: upload to internet
QR Code Image Generator No Restart Featured
Create a QR Code of the selected text or current URL. Use CTRL-SHIFT-Q to quickly see the QR Code. Also possible to create a QR Code from free text within Firefox. Works completely offline! Now with UTF8 support.
Restyle the web with Stylish, a user styles manager. Stylish lets you easily install themes and skins for Google, Facebook, YouTube, Tumblr, and many, many other sites. You can even customize Firefox and other programs themselves.
Font Finder Featured
FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.
Make the web faster, more private, and more secure.
User-Agent Switcher No Restart Featured
Quickly and easily switch between popular user-agent strings.
Firebug No Restart Featured
Nimbus Screen Capture - editable screenshots No Restart Featured
1) Screen capture web pages.
2) Selected regions.
3) Whole browser windows.
Edit screenshots and save the images to either local file or Google Drive. Annotate screenshots in a very user-friendly interface with different tools. Upload and share!
Clear Console Featured
One click to clear your cache, cookies, history, html5/local storage, http logins, all of them or restart your browser with/without notifications.
Ghostery No Restart Featured
Increase your browsing privacy, protection, and speed.
Proxy Switcher No Restart Featured
Access to the complete Firefox's proxy settings right from a toolbar panel
Simulate the use of a series of proxy changing at each new connection.
User Agent Switcher Featured
The User Agent Switcher extension adds a menu and a toolbar button to switch the user agent of a browser.
Easy Copy Featured
Copy links to a page with one click, ready to paste anywhere else, eg. emails, blogs, forums and Twitter. Copy a single page, all open tabs or all links on a page.
Emoji Keyboard No Restart Featured
A free Emoji Keyboard extension of the web tool http://emojikeyboard.org. This extension lets you input emojis right on the Firefox web browser of your computer.