Broken Link Checker
A SEO tool to find broken (404) and redirected (301, 307, 308) links in all frames
1,909 users
Youtube Play All
Adds a 'Play All' button to YouTube, allowing video playback in Latest, Popular, or Oldest order.
1,896 users
SEO Analysis & Website Review by WooRank
Instant SEO analysis and website reviews for SEO, mobile, usability and social media. The freshest data when and where you want it.
1,873 users
View Page Source (Mobile)
Adds the ability to open the page source in a new tab via button (Desktop) or menu (Firefox for Android).
1,860 users
Siteimprove Accessibility Checker
Jumpstart your web accessibility efforts directly in Firefox. Is your web page accessible for everyone? Assess the accessibility of your web pages conveniently in Mozilla Firefox browser with the Siteimprove Accessibility Checker.
1,851 users
Laboratory (Content Security Policy / CSP Toolkit)
Because good website security shouldn't only be available to mad scientists! Laboratory is a WebExtension that helps you generate a Content Security Policy (CSP) header for your website.
1,844 users
Dark Night Mode
It is a universal night mode for the entire Internet. It uses a special algorithm to automatically change the colors of the websites you visit into dark mode so that you can browse without straining your eyes, especially at night.
1,832 users
PixelZoomer
PixelZoomer takes a screenshot of the current website and provides various tools for pixel analysis. You can zoom into websites (up to 3200%), measure distances and pick colors with an eye dropper.
1,824 users
Clear Site Cookies
Clear the cookies of the current website, with cookie preview and precise cookie selection.
1,822 users
HackTools
Hacktools, is a web extension facilitating your web application penetration tests, it includes cheat sheets as well as all the tools used during a test such as XSS payloads, Reverse shells to test your web application.
1,820 users
Enable Selection and Copy
Force enable text selection and copy. (mod by Gary) This is modded from another well-known addon and makes it function on local files also. Nothing else changed.
1,806 users
Xdebug-ext
Adds a simple button to inject a Xdebug cookie. Compatible with Firefox 57+ (Quantum). It is a port of "The easiest Xdebug" Addon by Nikita Nikitin, which is not compatible with WebExtensions.
1,776 users
Asciidoctor.js Live Preview
Render AsciiDoc (.ad, .adoc, .asciidoc) as HTML inside Firefox!
1,762 users
Rotate that Video Player
Improve your video experience by effortlessly rotating your video clips by 90, 180, or 270 degrees.
1,761 users
Image saver
Save any images in page directly from context menu, this includes svg elements, css background images and direct child images.
1,761 users
Extended Color Management
Ever wish that Firefox didn't use color management when viewing images or video? Turn it off easily with this add-on.
1,753 users
Amadeus Digital DNA Extension
The Amadeus Digital DNA Extension provides end-users the ability to authenticate on some dedicated Amadeus web applications with a second factor.
1,750 users
YouTube Background Play
Keep YouTube videos playing when you switch tabs or minimize your browser. Perfect for listening to music or podcasts in the background.
1,732 users
