7,513 extensions found in Web Development

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Google Lighthouse
Lighthouse is an open-source, automated tool for improving the performance, quality, and correctness of your web apps.
Rated 3.5 out of 5
Google Lighthouse
15,471 users
Yandex Search
Adds Yandex for search engines
Rated 4.2 out of 5
KDev
15,141 users
Text Link
Allows URI texts written in webpages to be loaded by double clicks.
Rated 4.2 out of 5
Piro (piro_or)
14,670 users
Lightning Autofill
The most popular autofill extension, boosting productivity since 2010.
Rated 3.4 out of 5
tohodo.com
13,776 users
RESTED
A REST client for the rest of us
Rated 4.4 out of 5
Eline H
13,523 users
Chrome Mask
Makes Firefox wear a mask to look like Chrome to websites that block Firefox otherwise.
Rated 4.4 out of 5
Dennis Schubert
12,755 users
JavaScript Toggle On and Off (WebExtension)
Toggle JavaScript engine on and off the easy way
Rated 4.1 out of 5
tlintspr
12,228 users
javascript
add javascript that will run on this domain. back up your scripts in the options area (shortcut there by clicking the "JS" letters in the bottom right)
Rated 4.3 out of 5
chee
12,152 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
12,053 users
Fake Filler
A form filler that fills all form inputs (textboxes, textareas, radio buttons, dropdowns, etc.) with fake and randomly generated data. The purpose of this extension is to help developers and testers test forms quickly and easily.
Rated 4.4 out of 5
Hussein
11,995 users
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
Rated 4.4 out of 5
Lauri Rooden
11,860 users
Export Cookies
Export cookies to a Netscape format cookies.txt file.
Rated 4.3 out of 5
Rotem Dan
11,808 users
Flag Cookies
A cookie and browser storage data manager on steroids to mark, 'flag', and manage cookies using rulesets.
Rated 3.8 out of 5
Jan Riechers
11,741 users
Header Editor
Manage browser's requests, include modify the request headers and response headers, redirect requests, cancel requests
Rated 4.7 out of 5
泷涯
11,380 users
Allow CORS: Access-Control-Allow-Origin
Easily add (Access-Control-Allow-Origin: *) rule to the response header.
Rated 3 out of 5
Muyor
11,337 users
Mobile emulator
Smartphone emulator on computer very realistic with several models to test mobile websites.
Rated 3.9 out of 5
François
10,989 users
Empty Cache Button
Cache clearing made easy. One click.
Rated 4.5 out of 5
mvm
10,885 users
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Rated 3.7 out of 5
Milen
10,858 users
Fonts Ninja
Speed up your design workflow!
Rated 4.7 out of 5
Fonts Ninja
10,794 users
IP Address and Domain Information
The Ultimate online investigation tool! See detailed information about every IP Address, Domain Name and Provider.
Rated 4.5 out of 5
webdev7
10,754 users
RESTer
A REST client for almost any web service.
Rated 4.8 out of 5
Jan
10,233 users
Proxy Toggle
Toggle between direct connection and a single proxy server via a toolbar icon.
Rated 4.6 out of 5
Richard West
9,896 users
Angular DevTools
Angular DevTools extends Firefox DevTools adding Angular specific debugging and profiling capabilities.
Rated 3.5 out of 5
Angular
9,458 users
axe DevTools® - Web Accessibility Testing
Add accessibility auditing to the Firefox Developer Tools
Rated 4.5 out of 5
Deque Systems Inc.
9,098 users
Refined GitHub
Simplifies the GitHub interface and adds many useful features.
Rated 4.9 out of 5
Sindre Sorhus
9,047 users