And what excuse do you have for Firefox dropping PWA support? Or is it just Apple that is evil?

In what way has Firefox dropped PWA support? They continue to support all the major APIs relevant to PWAs. Which you can see a thorough list of on Mozilla's MDN docs here:

https://developer.mozilla.org/en-US/docs/Web/Progressive_web...

APIs sure, installing on desktop, no. A bit further down on the page linked via the second link:

"On desktop:

    Firefox and Safari do not support installing PWAs on any desktop operating systems."

Safari can absolutely install PWAs on desktop