Did you test in Safari? Doesn't seem like a simple selector change can fix it

I don't think it is because of the browser, it happens for me on Firefox as well:

Did you test in Safari

No, I am on Linux

Yup, you are right, I now see the error on Chrome as well:

The feature still works on some pages but not others. Make sure that they all still work after this PR: https://github.com/sindresorhus/refined-github/blob/main/source/features/clean-conversation-headers.tsx

I don't understand why it works only on some pages, what's missing and why? mmm

Will test on all

Update: I checked around half the features folder (around 100) - all except the css-only features have a description box next to them with this fix.

I thought it might have been because of an update - I didn't see any of the previous selectors when inspecting the HTML

Tested it on pretty much all features now (and discovered that firefox does not crash with almost 200 tabs open - yay 😅🎉) - it works! Any other changes to be made?