915 extensions found in Web Development

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Dark Reader
RecommendedRecommended
Dark mode for every website. Take care of your eyes, use dark theme for night and daily browsing.
Rated 4.5 out of 5
Dark Reader Ltd
1,266,924 users
Stylus
RecommendedRecommended
Redesign your favourite websites with Stylus, an actively developed and community driven user-style manager. Easily install custom themes from popular online repositories, or create, edit, and manage your own personalised CSS stylesheets.
Rated 4.7 out of 5
Stylus Team
128,627 users
Chrome Mask
RecommendedRecommended
Makes Firefox wear a mask to look like Chrome to websites that block Firefox otherwise.
Rated 4.5 out of 5
skyschub
53,101 users
Tampermonkey
Tampermonkey is the world's most popular userscript manager.
Rated 4.7 out of 5
Jan Biniok
754,703 users
Cookie-Editor
Cookie-Editor lets you efficiently create, edit and delete a cookie for the current tab. Perfect for developing, quickly testing or even manually managing your cookies for your privacy.
Rated 4.1 out of 5
cgagnier
125,875 users
ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
Rated 4.1 out of 5
Alex Sirota
122,916 users
Ruffle - Flash Emulator
Putting Flash back on the web. Designed to be easy to use, this extension will seamlessly enable you to play flash content, with no extra configuration required!
Rated 4.6 out of 5
Ruffle
77,489 users
User-Agent Switcher
Easily override the browser’s User-Agent string
Rated 4.3 out of 5
ntninja
59,373 users
Cookie Quick Manager
An addon to manage cookies (view, search, create, edit, remove, backup, restore, protect from deletion and much more). Firefox 57+ is supported.
Rated 4.4 out of 5
Ysard
43,754 users
Bato Image Auto-Fixer
Detect broken bato.to images and automatically fix them.
Rated 4.2 out of 5
RaidenOQ
33,237 users
WhatFont
A wrapper for Chengyin Liu's WhatFont tool
Rated 4.9 out of 5
Zack Michener
31,600 users
Disable JavaScript
Adds the ability to disable JavaScript for specific sites or specific tabs. You can customize the default JS state (on or off), the disable behavior (by domain or by tab) and much more.
Rated 4.4 out of 5
Yubabul Tksbbd
30,088 users
Disable WebRTC
WebRTC leaks your actual IP addresses from behind your VPN, by default.
Rated 4.4 out of 5
Chris Antaki
21,435 users
Google Lighthouse
Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.
Rated 3.6 out of 5
Google Lighthouse
14,060 users
JavaScript Toggle On and Off (WebExtension)
Toggle JavaScript engine on and off the easy way
Rated 4.1 out of 5
tlintspr
11,888 users
My IP Hider VPN
My IP Hider VPN is number one tool for hiding your IP and unblocking any web site! If your Firefox version is less then 55 please install older My IP Hider VPN from "Version History" (https://goo.gl/7ZQQjZ)
Rated 4.7 out of 5
MyIpHider.com
11,606 users
Netmirror Extension
Add, modify or remove a header for any request.
Rated 4.1 out of 5
Netmirror
11,384 users
RESTED
A REST client for the rest of us
Rated 4.3 out of 5
Eline H
11,086 users
Save Screenshot
Saves the current page as image file or copies it to clipboard.
Rated 4.4 out of 5
Manuel Reimer
10,449 users
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
Rated 4.4 out of 5
Lauri Rooden
9,316 users
Empty Cache Button
Cache clearing made easy. One click.
Rated 4.5 out of 5
mvm
8,975 users
ScriptCat
Everything can be scripted, allowing your browser to do more!
Rated 4.7 out of 5
王一之
8,835 users
Proxy Toggle
Toggle between direct connection and a single proxy server via a toolbar icon.
Rated 4.5 out of 5
Richard West
8,751 users
MobiDevTools
A mobile devtools for debugging web sites and applications with the console, DOM, network info, sources, and more.
Rated 3.9 out of 5
Francesco De Stefano
7,968 users
IPvFoo
Display the server IP address, with a realtime summary of IPv4, IPv6, and HTTPS information across all page elements.
Rated 4.8 out of 5
Paul Marks
7,127 users