WhatRuns
Discover what runs a website - This Firefox extension helps you identify technologies used on any website at the click of a button.
8,930 users
HackBar V2
[No License, FOREVER FREE] A HackBar for new firefox (Firefox Quantum). This addon is written in webextension and alternatives to the XUL version of original Hackbar. You can ask request here: https://github.com/Hack-Free/HackBar
8,784 users
Html Validator
HTML Validator is a Mozilla extension that adds HTML validation inside Firefox, Mozilla. The number of errors of a HTML page is seen on the form of an icon For Firefox 56, use 0.974 (see all versions below). For Firefox 57, see Web Extensions.
8,737 users
signTextJS plus
window.crypto.signText replacement plus enhancements
8,615 users
Refined GitHub
Simplifies the GitHub interface and adds many useful features.
8,454 users
daily.dev | The homepage developers deserve
Get one personalized feed for all the knowledge you need as a developer.
8,450 users
Mobile emulator
Smartphone emulator on computer very realistic with several models to test mobile websites.
8,431 users
BuiltWith
BuiltWith is a web site profiler tool. Upon looking up a page, BuiltWith returns a list all the technologies in use on that page that it can find.
8,388 users
HackBar
A HackBar for new firefox (Firefox Quantum). This addon is written in webextension and alternatives to the XUL version of original Hackbar. Press F12 to use HackBar
8,380 users
Ignore X-Frame-Options Header
Allows all sites to be loaded in iframes, despite X-Frame-Options header settings.
8,240 users
axe DevTools® - Web Accessibility Testing
Add accessibility auditing to the Firefox Developer Tools
7,975 users
Page Saver WE screenshot capture tool
Quickly and easily capture an image of a web page. Options allow you to control output format (PNG or JPEG), file name and more.
7,834 users
Purple Ads BlockerPurple Ads Blocker
Purple AdBlock is a adblock for Twitch.tv
7,699 users
Export Cookies
Export cookies to a Netscape format cookies.txt file.
7,625 users
ruler
Simple tool for measuring arbitrary parts of a page. Does not and will never contain adware.
7,576 users
Form History Control
Manage form history entries (search, edit, cleanup, export/import) and easy text formfiller. Auto-save text entered in any form while typing to allow fast recovery when disaster strikes.
7,575 users
Apollo Client Devtools
GraphQL debugging tools for Apollo Client.
7,559 users
All Downloader Professional
All Downloader Professional finds links, images, videos, documents on a website an make them downloadable.
7,430 users
JetBrains Toolbox Extension
Clone and open projects from GitHub, GitLab, and Bitbucket in JetBrains IDEs right from your browser
7,272 users
Save Screenshot
Saves the current page as image file or copies it to clipboard.
7,229 users
Cookie Remover
Removes cookies for the current site
6,957 users
WebScrapBook
Capture web pages to local device or backend server for future retrieval, organization, annotation, and edit.
6,939 users
JavaScript Switcher
A lightweight addon that adds a Toggle button in URL bar, for toggling JavaScript (on or off) individually per domain, and stores that for future visit. Works also with Firefox 57+.
6,822 users
Night Eye - Dark mode
With Night Eye, you can easily switch websites between dark and light mode as desired to take care of your eyes and reduce eye strain. Make your online experience more comfortable and enjoyable with this simple and convenient tool.
6,674 users
EditThisCookie2
EditThisCookie is a cookie manager. You can add, delete, edit, search, protect and block cookies!
6,582 users