Why-you-should-avoid-Google-AMP VS TabMixPlus

AMP (Accelerated Mobile Pages): AMP is an open-source initiative by Google that aims to make mobile pages load faster. By implementing AMP, you can create mobile-friendly web pages that load almost instantly.

sigh... guessing you were on mobile and it was just easier but since I consider AMP to shit, for anyone else who wants it, here is the normal non-AMP link:

(AMP itself is just an open source web framework. For example, all Axios pages actually use AMP.)

The link you have submitted is an AMP link These have be criticised by many people for a variety of reasons. In view of that we encourage users to not use AMP links for submissions but instead to use the actual URL linked to publishers site. If you are on a mobile device and don't know how to get the proper URL consider trying to disable Google Search and you should be furnished with actual links to real websites and not googles referred links.

It's an annoying AMP-link, never link those.

The exception is Redirect AMP To HTML, which does just that. (AMP has various organisational and technical issues; bypassing it also makes page links shorter when quoted).

Automatically redirects AMP links to their normal counterparts

There are some examples you can explore that I am aware of: https://github.com/onemen/TabMixPlus and https://github.com/numirias/paxmod

Yes. The latest update was on the 14.03.2023. https://github.com/onemen/TabMixPlus

Nah, TabMixPlus. Technically still runs on modern Firefox but you have to turn off signature signing and it breaks every few versions.

Tab Mix Plus https://github.com/onemen/TabMixPlus/releases

Oh, okay. This is the one I tried for Firefox: https://github.com/onemen/TabMixPlus

What/where is the actual .xpi file that is to be downloaded and installed from here after following instructions here?

Install https://github.com/onemen/TabMixPlus in Firefox Nightly or Developer Edition. It is about as easy as installing any extension and FAR easier than messing with userChrome.