I’ve seen a few posts that have done this. I was thinking that maybe it was just because someone commented on an old post, and it bumped it up into the feed, but I’ve also seen one or two that don’t have any new comments at all, just 2-year-old posts with 2-year-old comments randomly sprinkled into the feed.

I just got the Flatpak version today, so for anyone scrolling by this post again its finally been released on Flathub

I’ve never used it myself, but I’ve heard a lot of people use something called birdtray to do that, it’s made specifically for Thunderbird

It is, but for this it could still be considered separate depending how sites implement it because this is checking how the page is loading itself on the browser, not an is-chromium checker.

I wonder if sites that implement this and lock certain browsers out are valid for web compatibility reports

DRM for the web, think “you must disable your adblocker to use this site” except it actually works, and can do much more like a site can make it where you can only open it on x specific version of Google Chrome, refusing access to Firefox or MS edge users if they wanted. Or it could refuse to work if any extensions are enabled (people using lesser known accessibility extensions for vision difficulties etc. may be refused access to sites).

Well-intentioned sites hopefully won’t abuse this, but the large chunk of sites, like 80% of the internet, likely will.