Add-ons
To try the thousands of add-ons available here, download Mozilla Firefox, a fast, free way to surf the Web!
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Choose from thousands of extra features and styles to make Firefox your own.
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Font Finder
FontFinder is created for designers, developers and typographers. It allows a user to analyze the font information of any element on a page, copy any piece(s) of that information to the clipboard, and perform inline replacements to test new layouts.
25,541 users -
Classic Toolbar Buttons
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.
Beta builds on versions page!29,033 users -
Emoji Keyboard
A free extension of the web tool https://emojikeyboard.org. It helps input emoji in the web browser with an extensive search functionality.
103,937 users
Most Popular See all »
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The best security you can get in a web browser!
Allow active content to run only from sites you trust, and protect yourself against XSS and Clickjacking attacks.1,720,302 users -
Firebug integrates with Firefox to put a wealth of development tools at your fingertips while you browse. You can edit, debug, and monitor CSS, HTML, and JavaScript live in any web page...1,317,629 users -
Automate Firefox. Record and replay repetitive tasks. If you're tired of manually visiting the same sites, filling out forms, downloading files and extracting data, then iMacros is for you! Save time, effort and money with iMacros browser automation!1,032,925 users -
Rotates complete browser profiles ( from real browsers / devices ) at a user defined time interval. It includes many extra privacy enhancing options636,008 users -
Capture the whole page or any portion, annotate it with rectangles, circles, arrows, lines and text, blur sensitive info, one-click upload to share. And more!413,769 users
Top Rated See all »
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Open With Photoshop is a new companion for web and graphic designers to open up any web image with Adobe Photoshop via a single and quick mouse click.11,703 users -
Does everything for an HTML table: Copy (table/row/column/cell), Sort (multi-column), Search (regex, range operations ...), Filter, Chart, Statistics, Rearrange, Combine/Compare. To use: Right click in a real HTML table for the "tabletools2" option.11,185 users -
'Classic Toolbar Buttons' add-on restores old toolbar button ui (known from Fx 4-7s small view, Fx 4-12s large view & Tb 5-14) for current Firefox, Thunderbird and Seamonkey versions.
Beta builds on versions page!29,033 users -
The "NewScrollbars"-extension replaces default scrollbars of Firefox and Thunderbird with colorized ones (partly) known from "Noia themes".13,781 users -
Download files using curl or wget. This addon generates curl/wget commands that emulate the request as though it's coming from your browser allowing you to download protected files directly to a separate machine (e.g. server).6,316 users
Recently Added See all »
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Add a button in the url bar to block or enable javascript per-site.0 users -
Display the server IP address, with a realtime summary of IPv4, IPv6, and HTTPS information across all page elements.
(This is primarily a Chrome extension, so it's a bit glitchy due to Firefox's inexact implementation of the APIs.)10 users -
Add repository size to their github homepage.
⚠ This addon use the size as returned by the GitHub API and may be innacurate due to how GitHub stores git repositories!2 users -
Poop is an ad-blocker which blocks ads - and the pages that host them.
The mission of the project is to leave the user with a purely non-commercial web browsing experience.5 users
See all 2521 extensions in Web Development »
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