zlacker

>>mrspen+(OP)
This is because the browser fails to load some JS on the control panel because the browser blocks them. That's it.

>>rvnx+o2
This is an infuriatingly poor error message if the problem is disabled JavaScript. Surely they can detect that and show a proper error instead of trying to be cute with this "Your browser is a bit unusual" junk?

>>alias_+44
It's hard to differentiate between completely disabled JavaScript, some individual JavaScript files being blocked by an (overzealous?) ad blocker, and the browser not implementing some required JavaScript feature.

>>pdw+k5
Actually it's trivial to detect if JS was completely blocked with the <noscript> tag. https://developer.mozilla.org/en-US/docs/Web/HTML/Element/no...

And on the flip side you can trivially detect if some .js file was blocked from loading with some inline <script> tag that checks for whatever the .js file should expose.

The third case with the browser not implementing some feature is a bit more work but usually also rather easy to do.