[DevTools Bug]: Profiling not supported error with up-to-date React.

[patrickwalton]

Website or app

https://vercel.com/login

Repro steps

When I open React Developer Tools profiler page, I get the following error:

Profiling not supported.
Profiling support requires either a development or profiling build of React v16.5+.

Learn more at [reactjs.org/link/profiling](https://fb.me/react-devtools-profiling).

I first saw the problem on my own app, which is running React 18 and NextJS 15, but was able to reproduce the problem on every other NextJS react page I could find.

I am running Google Chrome 131.0.6778.204 on Fedora 40. My version of React Developer Tools is 6.0.1 (10/15/2024).

If I test the same conditions, but on Firefox, profiling works, suggesting it is a problem with React Dev Tools.

How often does this bug happen?

Every time

DevTools package (automated)

No response

DevTools version (automated)

No response

Error message (automated)

No response

Error call stack (automated)

No response

Error component stack (automated)

No response

GitHub query string (automated)

No response

[imsharukh1994]

@patrickwalton Cleared cache and reinstalled React Developer Tools extension.
Tested the same conditions in Firefox where profiling works fine.
Tried using Incognito mode with only the React DevTools extension enabled.

[V3RON]

You cannot profile applications built in production mode, as they are not instrumented. As long as you run your application in development mode, you will be able to profile it.