843 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
1,279,517 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
124,619 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
52,831 users
Tampermonkey
Tampermonkey is the world's most popular userscript manager.
Rated 4.7 out of 5
Jan Biniok
763,137 users
ColorZilla
Advanced Eyedropper, Color Picker, Gradient Generator and other colorful goodies...
Rated 4.1 out of 5
Alex Sirota
131,090 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 4.2 out of 5
cgagnier
121,423 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
78,494 users
User-Agent Switcher
Easily override the browser's User-Agent string
Rated 4.3 out of 5
ntninja
61,111 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 4.3 out of 5
Ysard
45,824 users
Bato Image Auto-Fixer
Detect broken bato.to images and automatically fix them.
Rated 4.2 out of 5
RaidenOQ
36,667 users
WhatFont
A wrapper for Chengyin Liu's WhatFont tool
Rated 4.9 out of 5
Zack Michener
33,555 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
31,071 users
Disable WebRTC
WebRTC leaks your actual IP addresses from behind your VPN, by default.
Rated 4.4 out of 5
Chris Antaki
21,527 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
15,034 users
JavaScript Toggle On and Off (WebExtension)
Toggle JavaScript engine on and off the easy way
Rated 4.1 out of 5
tlintspr
12,473 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
12,080 users
RESTED
A REST client for the rest of us
Rated 4.3 out of 5
Eline H
12,049 users
Save Screenshot
Saves the current page as image file or copies it to clipboard.
Rated 4.5 out of 5
Manuel Reimer
10,704 users
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
Rated 4.4 out of 5
Lauri Rooden
9,863 users
Empty Cache Button
Cache clearing made easy. One click.
Rated 4.5 out of 5
mvm
9,824 users
ScriptCat
Everything can be scripted, allowing your browser to do more!
Rated 4.7 out of 5
王一之
9,363 users
Proxy Toggle
Toggle between direct connection and a single proxy server via a toolbar icon.
Rated 4.6 out of 5
Richard West
8,975 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
7,325 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
7,268 users
Netmirror Extension
Add, modify or remove a header for any request.
Rated 4.4 out of 5
Netmirror
7,167 users