Most Popular Extensions
Play all videos on YouTube with your preferred settings (size, quality, playback rate, …) without cookies using only HTML5.
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Image Zoom Requires Restart
Adds zoom and rotation functionality for images...
The most efficient blocker for Firefox.
No ads, no tracking, and insanely faster page loads.
MeasureIt Requires Restart
Draw a ruler across any webpage to check the width, height, or alignment of page elements in pixels.
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.
Modify Headers Requires Restart
Add, modify and filter the HTTP request headers sent to web servers. This addon is particularly useful for Mobile web development, HTTP testing and privacy.
Youtube Downloader 4K - Video Downloader Requires Restart
Download from YouTube 4K videos and thousands other video websites.
ScrapBook Requires Restart
Helps you to save Web pages and organize the collection.
FirePath Requires Restart
FirePath is a Firebug extension that adds a development tool to edit, inspect and generate XPath 1.0 expressions, CSS 3 selectors and JQuery selectors (Sizzle selector engine).
R-kiosk Requires Restart
Real Kiosk is a Firefox extension that defaults to full screen, disables all menus, toolbars, key commands and right button menus. Alt+Home still takes you home. ...
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.
Tab Groups are an easy way to organize a lot of tabs. You can visually group related tabs, switch between groups, and quickly search through all of your tabs to switch to a specific one.
This extension automatically sets Yahoo.com as your homepage and new tab page.
Access your Identity Safe Vault, which remembers your usernames and passwords for single-click access to your favorite sites.
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.
HttpRequester Requires Restart
A tool for easily making HTTP requests (GET/PUT/POST/DELETE), viewing the responses, and keeping a history of transactions.
ipFood Requires Restart
Simulate the use of a series of proxy changing at each new connection.
Text Link Requires Restart
Allows URI texts written in webpages to be loaded by double clicks.
Live HTTP Headers Requires Restart
View HTTP headers of a page and while browsing.