signTextJS plus
window.crypto.signText replacement plus enhancements
10,082 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
10,014 users
Emoji Keyboard - Emojis For Firefox
A free extension of the web tool https://coolsymbol.com/emojis/emoji-for-copy-and-paste.html. It helps input emoji in the web browser with an extensive search functionality.
9,464 users
Mobile emulator
Smartphone emulator on computer very realistic with several models to test mobile websites.
9,325 users
WhatRuns
Discover what runs a website - This Firefox extension helps you identify technologies used on any website at the click of a button.
9,243 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.
9,153 users
Angular DevTools
Angular DevTools extends Firefox DevTools adding Angular specific debugging and profiling capabilities.
8,792 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.
8,703 users
Refined GitHub
Simplifies the GitHub interface and adds many useful features.
8,645 users
axe DevTools® - Web Accessibility Testing
Add accessibility auditing to the Firefox Developer Tools
8,415 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.
8,318 users
Ignore X-Frame-Options Header
Allows all sites to be loaded in iframes, despite X-Frame-Options header settings.
8,284 users
ruler
Simple tool for measuring arbitrary parts of a page. Does not and will never contain adware.
8,002 users
Apollo Client Devtools
GraphQL debugging tools for Apollo Client.
7,885 users
Export Cookies
Export cookies to a Netscape format cookies.txt file.
7,870 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.
7,792 users
Save Screenshot
Saves the current page as image file or copies it to clipboard.
7,662 users
Purple Ads BlockerPurple Ads Blocker
Purple AdBlock is a adblock for Twitch.tv
7,608 users
All Downloader Professional
All Downloader Professional finds links, images, videos, documents on a website an make them downloadable.
7,567 users
WebScrapBook
Capture web pages to local device or backend server for future retrieval, organization, annotation, and edit.
7,270 users
Cookie Remover
Removes cookies for the current site
7,176 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+.
6,979 users
EditThisCookie2
EditThisCookie is a cookie manager. You can add, delete, edit, search, protect and block cookies!
6,918 users
Live Server Web Extension
Live Reload feature for Dynamic content (PHP, Node.js, ASPNET - Whatever, it doesn't matter). This extension is for Live Server - VSCode Extension (required v3.0.0+).
6,788 users
X-Forwarded-For Header
This extension allows you quickly to set the X-Forwarded-For HTTP Header
6,715 users