Add extensions, get work done

Generates the histogram of a selected image.

Yet, just another json content viewer plugin for Firefox. Before using, you should go to the "about:config" page and toggle the "devtools.jsonview.enabled" to false first.

DOMLogger++ allows you to monitor, intercept, and debug JavaScript sinks based on customizable configurations.

Cache Longer speeds up your browsing by make your browser cache things for longer.

LinkParser helps you analyze the links on the page you are on at that very moment. It can differentiate between 9 different types of links and can mark them in different colors. Very customizable.sdas

Enable offline caching on any web site or app, allowing for usage even without Internet access.

Seamlessly test website appearance on various mobile devices with this handy extension. Preview the responsive design in real-time.

The WonderProxy Switcher allows you to switch between HTTP proxy servers quickly and easily to speed up your website testing. Import proxies from your WonderProxy account or add your own custom servers.

Adds Testing Policy UI to Mozilla's Phabricator instance

Hook native JavaScript functions before page load to see how a website uses them. Narrow down output based on the appearance of URL and session artifacts, user configured strings/regex, blacklists and more.

Format Text, Replace, Insert HTML, BBCode, Markdown & Custom Texts

https://github.com/alexcodito/KnockoutContextHover KnockoutJS Context Hover - Development and debugging assistant for Knockout JS

Converts Current URL to QRCode.

A simple utility to see auto-filled saved passwords with double click on any page. Double click the password and it should show as a plain text.

This is a tool for web developers. It makes editing URL parameters for long URLs much easier. You can use this tool to view each URL param, add new or delete existing ones.

Debug games and apps written with PixiJS

Website analysis & SEO tool by iwebchk provides comprehensive website review in SEO, performance, validity, security, accessibility, social media, backlinks, visitors, technologies and usability.

HTTP Header Mangler inserts HTTP headers on a per host basis.

Saving form data to bookmarklets