Can confirm. I have an android device that was given to me by my company and PWAs work just fine in Firefox. It's not a matter of technical limitations, it's just the poor multitrillion dollar company is gonna screw over their customers while scary government bureaucrats won't let them have their cake and eat it as well.

Indeed, and the icon has a Firefox badge on it so I know it is Firefox running the show. If things go south I know who to blame: Firefox. The same goes for Cromite (which used to be Bromite, which is a de-fanged de-Googled version of Chromium) or any other browser which offers this functionality.

See, Apple? This is how you can implement PWAs so that users do not accuse you of other browser's problems. Then again I assume this is already known in Cupertino but not implemented because it would break down that wall around the garden, brick by brick.

"Apple could easily implement the same thing"

This is quite easier said than done. Simply copying a feature from competitor is not neccessarily easy especially if they challenge deep architectural decisions that have been made in the past.