automaticDark - Time-Based Theme Changer
Automatically change Firefox's theme based on the time.
9,322 users
SoundFixer
Helps you fix annoying sound problems on sites like YouTube: audio in one channel only, too quiet or too loud. (Unfortunately, this extension does not work on all websites because of cross-domain issues — but it does work on YouTube!)
37,981 users
Simple Tab Groups
Create, modify, and quickly change tab groups
84,006 users
Clippings
Save frequently-entered text for pasting later.
14,704 users
Livemarks
Get auto-updated RSS feed bookmark folders.
14,638 users
Measure-it
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
28,092 users
Feedbro
Advanced Feed Reader - Read news & blogs or any RSS/Atom/RDF source.
48,057 users
Grammar and Spell Checker - LanguageTool
With this extension you can check text with the free style and grammar checker LanguageTool. It finds many errors that a simple spell checker cannot detect, like mixing up there/their, a/an, or repeating a word.
354,264 users
Clear Cache
Clear browser cache with a single click or via the F9 key. F9 Fever! ;)
65,428 users
Clear Browsing Data
Delete browsing data directly from the browser toolbar. Clear cookies, history and cache with a single click.
19,237 users
Print Edit WE
Edit the contents of a web page prior to printing or saving. Elements in the web page can be edited, formatted, hidden or deleted. Unwanted content, such as adverts and sidebars, can easily be removed.
41,117 users
Bitwarden Password Manager
At home, at work, or on the go, Bitwarden easily secures all your passwords, passkeys, and sensitive information.
748,216 users
Search by Image
A powerful reverse image search tool, with support for various search engines, such as Google, Bing, Yandex, Baidu and TinEye.
324,983 users
PopUpOFF
Removes and prevents popups, overlays and cookie notifications, other tools do not. Enjoy the original look of the internet.
26,757 users
Flagfox
Displays a country flag depicting the location of the current website's server and provides a multitude of tools such as site safety checks, whois, translation, similar sites, validation, URL shortening, and more...
117,024 users
Tabby - Window & Tab Manager
Tabby helps you manage a lot of windows and tabs easily; it can help you open, close, move, pin, and do many other things on tabs and windows quickly. With Tabby, you can even save all you windows and tabs for later with just one click!
8,763 users
AdBlocker for YouTube™
Remove all annoying ads from YouTube.
479,601 users
New Tab Override
New Tab Override allows you to set the page that shows whenever you open a new tab.
66,322 users
Forecastfox (fix version)
Get international weather updates (via AccuWeather.com) displayed right in Firefox with this highly customizable extension.
18,462 users
EPUBReader
Read ePub files right in Firefox. No additional software needed!
136,162 users
Worldwide Radio
Listen to live radio stations from around the world!
39,094 users
Foxy Gestures
Mouse gestures for Firefox. A web extension alternative to FireGestures created by a long time FireGestures user.
22,459 users
Webmail Ad Blocker
Remove advertising clutter from your web-based email. Expand your viewable area by blocking and removing ads on the right-hand side of the screen when using Gmail, Hotmail, Outlook.com and Yahoo Mail.
29,018 users
FoxyTab
Collection of Tab Related Actions e.g. Duplicate, Close Duplicates, Close to the Left, Copy Title, Merge Windows, Save as PDF, Copy Urls Tab/All/Left/Right, Host keep/close/close other, Sort by URL/Title, Asce/Desc, Move, Reload, Reload Timer
21,416 users
Copy PlainText
Copy Plain Text without any formatting
29,053 users