9,175 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
17,023 users
Yandex Search
Adds Yandex for search engines
Rated 4.1 out of 5
KDev
16,395 users
SeoQuake SEO extension
Accelerate your SEO efforts on the fly. SEOquake is a free plugin for browsers that provides you with key SEO metrics for a specific page, along with other useful tools such as SEO Audit and many others.
Rated 4.4 out of 5
SeoQuake Team
16,139 users
RESTED
A REST client for the rest of us
Rated 4.4 out of 5
Eline H
14,754 users
Export Cookies
Export cookies to a Netscape format cookies.txt file.
Rated 4.4 out of 5
Rotem Dan
14,581 users
Text Link
Allows URI texts written in webpages to be loaded by double clicks.
Rated 4.2 out of 5
Piro (piro_or)
14,335 users
JavaScript Toggle On and Off (WebExtension)
Toggle JavaScript engine on and off the easy way
Rated 4.1 out of 5
tlintspr
14,252 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
14,129 users
Lightning Autofill
The most popular autofill extension, boosting productivity since 2010.
Rated 3.3 out of 5
tohodo.com
14,080 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
13,392 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
13,178 users
Flag Cookies
A cookie and browser storage data manager on steroids to mark, 'flag', and manage cookies using rulesets.
Rated 3.9 out of 5
Jan Riechers
12,249 users
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
Rated 4.4 out of 5
Lauri Rooden
12,216 users
Mobile emulator
Smartphone emulator on computer very realistic with several models to test mobile websites.
Rated 3.9 out of 5
François
11,796 users
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Rated 3.7 out of 5
Milen
11,724 users
Fonts Ninja
Speed up your design workflow!
Rated 4.6 out of 5
Fonts Ninja
11,529 users
Allow CORS: Access-Control-Allow-Origin
Easily add (Access-Control-Allow-Origin: *) rule to the response header.
Rated 2.8 out of 5
Muyor
11,359 users
RESTer
A REST client for almost any web service.
Rated 4.8 out of 5
Jan
11,355 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
11,340 users
Empty Cache Button
Cache clearing made easy. One click.
Rated 4.5 out of 5
mvm
11,272 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
11,059 users
axe DevTools® - Web Accessibility Testing
Add accessibility auditing to the Firefox Developer Tools
Rated 4.3 out of 5
Deque Systems Inc.
10,807 users
Save Screenshot
Saves the current page as image file or copies it to clipboard.
Rated 4.4 out of 5
Manuel Reimer
10,613 users
Angular DevTools
Angular DevTools extends Firefox DevTools adding Angular specific debugging and profiling capabilities.
Rated 3.3 out of 5
Angular
10,554 users
Proxy Toggle
Toggle between direct connection and a single proxy server via a toolbar icon.
Rated 4.6 out of 5
Richard West
10,271 users