Works great in Win 11 with Firefox 118.0.1 (64-bit). Its rating scale is from 0 to 100, so it's not like it provides a binary judgment. Use your own judgment with this as a tool.

Slightly aggravating that it gives me a score of 18%, but could be because I use adult language on Twitter.

The reviews here stating political bias are unfounded, zero evidence claims from users who are likely bad-faith reviewers.

If you are annoyed as I am with this 'unknown' banner and want only useful stuff to be displayed add this to your adguard custom filter:

twitter.com##div[class="rating-card Unknown"]

Pretty good extension, does it's job pretty well. The only issues I've had with it are that you can't access the settings via about:addons, and that sometimes duplicate "check user" buttons appear. I would like to see the former fixed, since it's a little annoying to have to keep the extension in the toolbar overflow to access the settings. A fix for the latter would be nice, but it's mitigated by just reloading the page so I don't really care about it that much.

Update: This is a must-have, although it still eats a lot of memory, causing Firefox to have little freezes while it garbage collects.

Now supports Android too.

was a handy utility to quickly tell if an account behaves in an automated way... unfortunately, twitter has killed it's access

i guess it was working too well.