As of today, it seems that the devtools are completely broken in the latest Firefox Nightly. The extension is throwing the same 2 errors in the Browser Console.
Screenshot with the errors:
https://i.imgur.com/EruH6dR.png
Reddit post I made with a few more details:
https://old.reddit.com/r/firefox/comments/9it1kl/react_devtools_broken_in_the_latest_nightly/
I have a feeling this is caused by a change in Firefox, not in the extension.
So I filed a bug here: https://bugzilla.mozilla.org/show_bug.cgi?id=1494281
I found the cause for this to be a bug that landed in Firefox Nightly yesterday: https://bugzilla.mozilla.org/show_bug.cgi?id=1485676
Bug https://bugzilla.mozilla.org/show_bug.cgi?id=1494281 is now fixed in Firefox Nightly. So React DevTools will start working again in Firefox Nightly!
Looks like everything is working as expected in the latest Nightly. Thanks for your hard work!
Most helpful comment
I have a feeling this is caused by a change in Firefox, not in the extension.
So I filed a bug here: https://bugzilla.mozilla.org/show_bug.cgi?id=1494281