"Paul" wrote

| This site seems capable of throwing up a "bad browser" result,
| with just about any browser. All depends on what mood it's
| in at the time.
|
| https://www.winhelp.us/internet-expl...favorites.html
|

?? It looks fine to me, with script, cookies,
3rd-party files and frames blocked in Pale Moon.
Except for the red panel at top that warns me
I absolutely must allow script.

The source code is mostly plain vanilla with
script for Google spyware and ads. There's just
one exception: A very funky block of heavily
obfuscated script near the bottom.
Above that code, in a comment that doesn't
show, is this:

"LEGAL NOTICE: The content of this website and all
associated program code are protected under the
Digital Millennium Copyright Act. Intentionally
circumventing this code may constitute a violation
of the DMCA."

*May* constitute. So you *may* be breaking
federal law if you disable script on that page and
allow them to hack you with their grotesquely
obfuscated script.

| You're not actually supposed to sniff User Agent strings,
| but they probably didn't get the memo. You're supposed to
| sniff capability instead.

I hope that was said sarcastically. Checking
capability and not sniffing userAgents is a
bald-faced scam that Microsoft are trying to
perpetrate as the new norm. They actually
spoof their UA in Edge. I had to write new
PHP on my webpages to recognize it. They
want me to give Edge my version for Firefox.
But they're not offering to be responsible for
the results. And I can't even install Edge. It
only comes as part of Win10. That's not a
browser to consider any more than Apple's
Safari is. If they want compatibility they can
either get their act together to make a real
browser, or make sure Edge matches IE in
its rendering.... which they won't do.