Why can't they just give a simple setting which lets users disable AMP? This is the most annoying about being forced to use AMP.
Firefox focus is a very good browser for opening links on WiFi or unlimited data when using another app. It's not very good at all at being a primary browser.
Or, you know, ask the site to stop using Google.
[0] https://nakedsecurity.sophos.com/2020/03/27/firefox-76-will-...
Then you have chosen to exclude yourself from knowing a large chunk of interesting information that was posted on web sites before the web went fully corporate.