Web Developer's Toolbox

by Mozilla

11 Add-ons in this Collection

Web Developer by chrispederick

Rated 4 out of 5 stars 486 reviews

261,702 users

The Web Developer extension adds various web developer tools to the browser.

React Developer Tools by React

Rated 4 out of 5 stars 50 reviews

51,295 users

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 React tab.

Vue.js devtools by Evan You, Akryum

Rated 5 out of 5 stars 104 reviews

25,758 users

DevTools extension for debugging Vue.js applications.

Redux DevTools by Zalmoxisus

Rated 4 out of 5 stars 26 reviews

13,297 users

DevTools for Redux with actions history, undo and replay.

aXe Developer Tools by Deque Labs

Rated 5 out of 5 stars 16 reviews

3,627 users

Add accessibility auditing to the Firefox Developer Tools

Spector.js by BabylonJS

Rated 5 out of 5 stars 8 reviews

1,324 users

Easily explore and debug any WebGL context.

DevTools Media Panel by Karolien Koorts, Gerald Squelart, others

Rated 5 out of 5 stars 10 reviews

1,438 users

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.

Laboratory (Content Security Policy / CSP Toolkit) by April King, Mozilla

Because good website security shouldn't only be available to mad scientists!

Laboratory is an experimental Firefox extension that helps you generate a Content Security Policy (CSP) header for your website.

Chrome Logger by Spencer T⋆ Obremski

Server-side debugging via web console, substituting native support for the Chrome Logger protocol developed by Craig Campbell ( https://craig.is/writing/chrome-logger/ ) in Firefox 43 – 56.

Fontanello by Oktavilla

A browser extension that lets you display the basic typographic styles of a text by right-clicking it.

Compat Report by Eduardo Bouças

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Rated 5 out of 5 stars 10 reviews

645 users

Shows a report of browser compatibility issues using data from MDN

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