Most Popular Extensions

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HttpRequester Requires Restart

A tool for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.

Rated 4 out of 5 stars (66)
87,592 users

Zoom Page Requires Restart

Full featured zoom manager with independent page and image zoom modes. Choose from four zoom modes: Default Zoom, Fit-To-Width, Default Zoom + Site Specific or Fit-To-Width + Site Specific. Button style and zoom levels are fully configurable.

Rated 5 out of 5 stars (158)
87,340 users

Cookies Manager+ Requires Restart

Cookies manager to view, edit and create new cookies. It also shows extra information about cookies, allows edit multiple cookies at once and backup/restore them.

Rated 5 out of 5 stars (71)
86,830 users

JavaScript Debugger Requires Restart

As of Firefox 33, Venkman *no longer works*, as the APIs which it needs have been removed.

Venkman is the code name for Mozilla's JavaScript Debugger. Venkman aimed to provide a powerful JavaScript debugging environment for Mozilla based browsers.

Rated 4 out of 5 stars (50)
85,643 users

Google Scholar Button

Lookup scholarly articles as you browse the web.

Rated 4 out of 5 stars (20)
84,856 users

Youtube and more – Easy Video Downloader Compatible with Firefox 57+

Download and save videos playing on a website like youtube to your hard disk

Rated 4 out of 5 stars (419)
84,802 users

Tree Style Tab Requires Restart

Show tabs like a tree.

Rated 4 out of 5 stars (1,265)
84,442 users

Yahoo Homepage

This extension automatically sets Yahoo.com as your homepage and new tab page.

Rated 3 out of 5 stars (78)
82,837 users

YouTube ALL HTML5

Play all videos on YouTube with your preferred settings (size, quality, playback rate, …) without cookies using only HTML5.

Rated 4 out of 5 stars (145)
82,748 users

UnMHT

UnMHT allows you to view MHT (MHTML) web archive format files, and save complete web pages, including text and graphics, into a single MHT file in Firefox/SeaMonkey.

Rated 4 out of 5 stars (240)
82,203 users

ipFood Requires Restart Featured

Simulate the use of a series of proxy changing at each new connection.

Rated 4 out of 5 stars (8)
80,231 users

Fast Dial Requires Restart

Visual bookmarks for Firefox.

Rated 3 out of 5 stars (2,333)
80,078 users

Norton Identity Safe Compatible with Firefox 57+

Access your Identity Safe Vault, which remembers your usernames and passwords for single-click access to your favorite sites.

Rated 2 out of 5 stars (69)
79,220 users

Remote XUL Manager

Manages the Remote XUL whitelist to allow websites and local files to load XUL content. For versions compatible with Firefox 41 and lower, see All Versions page below.

Rated 5 out of 5 stars (37)
78,189 users

Hotspot Shield Free VPN Proxy – Unblock Sites

Unblock any blocked website or content and stay secure and private with Hotspot Shield VPN. Easy-to-use interface with one-click activation. Unlimited bandwidth, completely FREE!

Rated 3 out of 5 stars (167)
77,246 users

ChatZilla Requires Restart

A clean, easy to use and highly extensible Internet Relay Chat (IRC) client.

Rated 4 out of 5 stars (128)
77,201 users

The Addon Bar (Restored)

Gives you a place to put all your add-on buttons without over-crowding the navigation bar.

Rated 5 out of 5 stars (330)
77,024 users

colorPicker

A very simple extension for learning web page colors. Copy the RGB or Hex color code of any pixel displayed in your browser to the clipboard (in CSS/HTML format). Similar in function to Internet Explorer's color picker.

Rated 4 out of 5 stars (46)
75,990 users

NoSquint Requires Restart

NoSquint is no longer maintained. :(

Rated 5 out of 5 stars (473)
75,321 users

adaware ad block

By blocking annoying ads and nosy trackers, adaware ad block nearly doubles your browsing speed! And with the most robust antivirus-level cloud-scanning technology of any ad blocker on the market, you’ll be safe from the latest cyber-threats.

Rated 4 out of 5 stars (57)
75,303 users