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.

React Developer Tools - Firefox Add-on for React Devs
React Developer Tools is a Firefox extension that gives developers the ability to inspect the React tree within their webpages, including aspects such as the component hierarchy, props, state, and more. The tool respects user privacy as it requires permissions to access the page's React tree, yet it transmits no data remotely. It is also fully open-source, with its code base available for perusal and contribution.
Add-on stats
Weekly download count: 3,262
Firefox on Android: No
Risk impact: High risk impact
Risk likelihood:
Manifest version: 3
Permissions:
- scripting
- storage
- tabs
Host permissions:
- <all_urls>
Size: 1.66M
Ranking
# 99 ▼ 1
Other platforms
Not available on Chrome
Not available on Android
Not available on Edge
Want to check extension ranking and stats more quickly for other Firefox add-ons?
Install
Chrome-Stats extension
to view Firefox-Stats data as you browse the Firefox Browser Add-ons.
Add-on summary
This extension requires permissions to access the page's React tree, but it does not transmit any data remotely. It is fully open source, and you can find its source code at https://github.com/facebook/react/tree/master/packages/react-devtools-extensions.
User reviews
Pros
- Well implemented
- Works nice
Cons
- Caused a high background RAM (4GB) occupation on Linux
- Component backlight does not work
- Warning message in local React app
Most mentioned
- High RAM usage
- Component backlight issue
- Warning message in console
User reviews
by Pawaris2732, 2025-01-20
by Firefox user 18692534, 2025-01-12
by Firefox user 18746956, 2024-12-24
Add-on safety
Risk impact
React Developer Tools requires some sensitive permissions that could impact your browser and data security. Exercise caution before installing.
Risk impact analysis details
- Critical Grants access to browser tabs, which can be used to track user browsing habits and history, presenting a privacy concern.
- Critical ****** ****** ** *** ********* ****** * *********** ******** **** ** ** *** ******* *** ****** **** **** *** ******* *****
- High ******* ******* **** *** ****** ***** *** ***** ** ******* **** ********* ********* ** * *********** *****
- Medium ****** ** ********* ****** ********* *** **** ****** **** **** ** ******* ** ********** **** ***********
- Low ******* ****** ** *** ********* ********
Risk likelihood
React Developer Tools has earned a fairly good reputation and likely can be trusted.
Risk likelihood analysis details
- Low This extension was updated more than 6 months ago. Older versions are more likely to be stable and safe.
- Low **** ********* *** ***** **** **** * ****** **** ***** ********** *** **** ****** ** ** ****** *** *****
- Low **** ********* *** **** **** ****** ******* ********** **** ****** ** ** ****** *** *****
- Good **** ********* *** **** **** *******
Upgrade to see full risk analysis details