No, the PWA thing is a separate annoyance. What I find is that in a lot of web apps, the app mostly works fine but has bugs that break certain things or are seriously inconvenient in Firefox only. Two I’ve experienced recently are Nextcloud Office slideshows (I need to search for/open a bug report honestly) and a web based billing software we use at work.
Downvoted not because it isn’t true, but because they aren’t automatically mutually exclusive and because it is an unnecessary jab at half of the human species. Why are we paying attention to divisive bullshit instead of focusing on things that actually have the potential to help?