Feature Queries Manager
Manage and toggle CSS on a page behind a @supports Feature Query.
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webhint
Check for best practices and common errors with your site's accessibility, speed, security and more.
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Selenium IDE
Selenium IDE is an integrated development environment for Selenium tests. It is implemented as a Firefox extension, and allows you to record, edit, and debug tests.
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Augury
Extends the Developer Tools, adding tools for debugging and profiling Angular applications.
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Fontanello
A browser extension that lets you display the basic typographic styles of a text by right-clicking it.
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ChromeLogger
Parses and displays messages from X-ChromeLogger-Data and X-ChromePHP-Data headers in DevTools Web Console facilitating server-side debugging via the Chrome Logger protocol ( https://craig.is/writing/chrome-logger/ ).
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Web Developer
The Web Developer extension adds various web developer tools to the browser.
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axe DevTools® - Web Accessibility Testing
Add accessibility auditing to the Firefox Developer Tools
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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.
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DevTools Media Panel
DevTools panel that displays technical details about media elements and webrtc on the current page; intended primarily for web developers to understand media playback issues on their sites, and for users to provide more informative bug reports.
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React Developer Tools
React Developer Tools is a tool that allows you to inspect a React tree, including the component hierarchy, props, state, and more. To get started, just open the Firefox devtools and switch to the "⚛️ Components" or "⚛️ Profiler" tab.
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