8,755 extensions found in Web Development

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Yandex Search
Adds Yandex for search engines
Rated 4 out of 5
KDev
15,401 users
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
15,375 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
14,706 users
Text Link
Allows URI texts written in webpages to be loaded by double clicks.
Rated 4.2 out of 5
Piro (piro_or)
14,092 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
13,867 users
RESTED
A REST client for the rest of us
Rated 4.4 out of 5
Eline H
13,391 users
Export Cookies
Export cookies to a Netscape format cookies.txt file.
Rated 4.4 out of 5
Rotem Dan
13,321 users
JavaScript Toggle On and Off (WebExtension)
Toggle JavaScript engine on and off the easy way
Rated 4.1 out of 5
tlintspr
13,135 users
Lightning Autofill
The most popular autofill extension, boosting productivity since 2010.
Rated 3.3 out of 5
tohodo.com
13,015 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
12,390 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
11,901 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
11,805 users
Mobile emulator
Smartphone emulator on computer very realistic with several models to test mobile websites.
Rated 3.9 out of 5
François
11,766 users
JSON Lite
Fast JSON viewer - highlights, shows items count/size, handles large files
Rated 4.4 out of 5
Lauri Rooden
10,993 users
Empty Cache Button
Cache clearing made easy. One click.
Rated 4.5 out of 5
mvm
10,622 users
Fonts Ninja
Speed up your design workflow!
Rated 4.7 out of 5
Fonts Ninja
10,609 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
10,495 users
Modify Header Value
Add, modify or remove a header for any request on desired domains.
Rated 3.7 out of 5
Milen
10,295 users
RESTer
A REST client for almost any web service.
Rated 4.8 out of 5
Jan
10,136 users
Allow CORS: Access-Control-Allow-Origin
Easily add (Access-Control-Allow-Origin: *) rule to the response header.
Rated 2.9 out of 5
Muyor
10,036 users
Save Screenshot
Saves the current page as image file or copies it to clipboard.
Rated 4.4 out of 5
Manuel Reimer
9,814 users
Proxy Toggle
Toggle between direct connection and a single proxy server via a toolbar icon.
Rated 4.6 out of 5
Richard West
9,603 users
Angular DevTools
Angular DevTools extends Firefox DevTools adding Angular specific debugging and profiling capabilities.
Rated 3.4 out of 5
Angular
9,410 users
Imageye - Image downloader
Find and download all images on a web page.
Rated 3.7 out of 5
Meagan Amrach
9,367 users
axe DevTools® - Web Accessibility Testing
Add accessibility auditing to the Firefox Developer Tools
Rated 4.5 out of 5
Deque Systems Inc.
9,342 users