Most Popular Extensions



Be in control of which cross-site requests are allowed. Improve the privacy of your browsing by not letting other sites know your browsing habits. Secure yourself from Cross-Site Request Forgery (CSRF) and other attacks.

Rated 4 out of 5 stars (225)
112,637 users


StumbleUpon is the easiest way to discover new and interesting photos, videos, web pages and more, recommended by a community of experts. Tell us what you are interested in and we recommend page after page of amazing stuff you’d never expect to see.

Rated 4 out of 5 stars (214)
112,514 users

X-notifier (for Gmail,Hotmail,Yahoo,AOL ...) Featured

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, POP3/IMAP, facebook, twitter and more

Rated 4 out of 5 stars (1,627)
110,193 users

JSONView No Restart

View JSON documents in the browser.

Rated 5 out of 5 stars (133)
109,216 users

McAfee Security Scan Plus detection No Restart

This extension allows Adobe installers to detect McAfee Security Scan Plus software is installed on your PC.

Rated 1 out of 5 stars (13)
109,135 users


YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. is the official open source website.

Rated 3 out of 5 stars (195)
108,799 users

All-in-One Gestures

This extension allows you to execute common commands using mouse gestures, rocker navigation, scroll wheel navigation and page...

Rated 4 out of 5 stars (423)
107,950 users


Read EPUB e-books and browse OPDS catalogs.

Rated 4 out of 5 stars (21)
107,250 users

Tree Style Tab

Show tabs like a tree.

Rated 4 out of 5 stars (1,222)
106,159 users


The quick and easy way to delete your browsing history, erase all temporary internet files, remove downloaded files history, cookies, Flash LSO, typed URLs. Allows to delete private data when Firefox closes. Supported ext. tools like CCleaner.

Rated 5 out of 5 stars (85)
103,521 users


An HTTP analyzer addon for Firefox

Rated 4 out of 5 stars (163)
103,041 users

Pearl Crescent Page Saver screenshot tool

Save an image of a web page (including Flash content) to a file. Web page screenshots may be captured interactively or from the command line. Options allow you to control the output format (PNG or JPEG), image file name, scaling, and much more.

Rated 4 out of 5 stars (79)
102,012 users

Gmail Notifier (restartless) No Restart Featured

Multiple account (or label) Gmail notifier (without storing passwords)

Rated 4 out of 5 stars (238)
101,934 users


ReminderFox displays and manages lists of reminders and ToDo's. ReminderFox makes sure you remember all of your important dates via easy-to-use lists, alerts, and alarms, right in your browser without the need for a separate calendar program.

Rated 4 out of 5 stars (496)
101,087 users

Classic Compact Options

This add-on allows one to customize the theme "Classic Compact". Options include: 10 different toolbar button sets; turning off gradient backgrounds; OS scrollbars; dark system color support; merging menu bar into one menu button; etc.

Rated 4 out of 5 stars (54)
100,046 users


The extension previously known as GooglePreview. Inserts preview images (thumbnails) and popularity ranks of web sites into the Google, Yahoo, Bing and DuckDuckGo search results pages.

Rated 4 out of 5 stars (392)
99,910 users

Feedly - Beyond Google Reader

A productive way to organize, read and share the content of your favorite feeds, blogs and news sites. Feedly offers a seamless transition from Google Reader.

Rated 5 out of 5 stars (3,596)
98,862 users

Pushbullet No Restart

Pushbullet enables you to see your calls and texts on your computer and easily send links and files from your computer to phone.

Rated 4 out of 5 stars (126)
98,769 users

Theme Font & Size Changer No Restart Featured

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.

Rated 5 out of 5 stars (149)
97,967 users

AdBlock Lite No Restart

Block ads seamlessly on popular websites

Rated 3 out of 5 stars (31)
97,335 users