Mozilla no longer checks their extensions for Firefox...
https://www.ghacks.net/2017/10/03/mozilla-changes-review-process-for-firefox-webextensions
Some are not what they seem...
https://www.ghacks.net/2018/08/15/mozilla-recommended-privacy-extension-had-phone-home-feature
Along with that, GitHub is owned, now, by... er... Microsoft!
They're up to their old tricks, already...
https://github.com/selfagency/microsoft-drop-ice
I've had a few Firefox extensions ask for money to continue their task. All binned immediately, but it's a growing trend.
It's got to the stage where I don't trust any of them, really. At least Opera v12 isn't much of a target. :)