Adblock Plus
One of the most popular free ad blockers for Firefox. Block annoying ads on sites like Facebook, YouTube and all other websites. Adblock Plus blocks all annoying ads, and supports websites by not blocking unobtrusive ads by default (configurable).
3,821,952 users
Evernote Web Clipper
Use the Evernote Web Clipper to save things you see on the web into your Evernote account.
89,420 users
Form History Control
Manage form history entries (search, edit, cleanup, export/import) and easy text formfiller. Auto-save text entered in any form while typing to allow fast recovery when disaster strikes.
7,774 users
Ghostery – Privacy Ad Blocker
Ghostery is a powerful privacy extension. Block ads, stop trackers and speed up websites.
1,049,093 users
NoScript Security Suite
The best security you can get in a web browser! Allow potentially malicious web content to run only from sites you trust. Protect yourself against XSS other web security exploits.
305,381 users
X-notifier (for Gmail,Hotmail,Yahoo,AOL ...)
Notifier for gmail, yahoo, hotmail, aol and more webmails. X-notifier(aka WebMail Notifier) checks your webmail accounts and notifies the number of unread emails... Supports : gmail, yahoo, hotmail, and more
9,431 users
Stylish - Custom themes for any website
Stylish lets you customize any website with custom user styles (themes for websites). Choose from the largest userstyles library to change the color scheme, background, and skin for Google, Facebook, YouTube and many, many more sites.
36,741 users
Nightly Tester Tools
Nightly Tester Tools (NTT) is an add-on for aiding testers of Nightly builds of Mozilla apps including Firefox.
1,644 users
Greasemonkey
Customize the way a web page displays or behaves, by using small bits of JavaScript.
197,194 users
Diigo Web Collector - Capture and Annotate
Enable multi-color highlighter and post-it notes as your reading aids; Capture the page or any portion to share or archive; Save everything online to allow access anywhere.
3,763 users
PixelZoomer
PixelZoomer takes a screenshot of the current website and provides various tools for pixel analysis. You can zoom into websites (up to 3200%), measure distances and pick colors with an eye dropper.
2,684 users
ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
149,971 users
LastPass Password Manager
LastPass, an award-winning password manager, saves your passwords and gives you secure access from every computer and mobile device.
548,937 users
Character Identifier
This extension adds a context menu item for selected text that provides more information (from the Unicode database) about the characters...
121 users
Web of Trust, MyWOT/WOT: Website Reputation Rating
Instantly know which websites to trust! WOT protects you while you browse, warning you against dangerous sites that host malware, phishing, and more.
56,505 users
G App Launcher (Google™ Shortcuts)
Previously known as Google™ Shortcuts.Display all Google services as buttons or as a space-saving dropdown menu next to your address bar. Reach services like Gmail, Google Drive, Maps, Calendar, and many more in a single click from your browser.
8,238 users
ActiveInbox for Gmail
Use Gmail to get things done. ActiveInbox turns Gmail into a GTD task manager, where your emails are your tasks. It lets you achieve inbox zero, never forget an important email, and move projects forward with ease.
62 users
SimilarWeb - Website Traffic Sources and Ranking
Get in-depth traffic and engagement stats for any website with a single click. See how popular a website is, its geography and traffic sources, .
12,587 users
TabsUp Homepage Manager
TabsUp opens your own set of bookmarks at browser startup with "once per day" option. PermaTabs opens all bookmarks from selected folder while RandomTabs some of them — randomly. Now you won't forget to look at your favourite pages from time to time.
23 users
Theme Font & Size Changer
Theme Font & Size Changer lets you change the global font size and font family used for the user interface in Firefox. Design your browser with your favorite font.
7,270 users
