Earlier quoted context omitted.
How about web apps too not show annoying pop-ups which are pretty useless in most cases? Websites which show two pop-ups (custom pop-up followed by browser pop-up) are worse.
My website doesn't show any popups. I have a settings dialog that user can open and setup email and other notifications. This will just not work anymore. I'll have to add some long winded FF specific explanation on what to do after clicking the button. Anyway the FF UI is broken if user physically can't see any reaction from the browser after he requests notifications by clicking anywhere on the page.
https://hacks.mozilla.org/2019/11/upcoming-notification-perm...
This is a frequent "mistake"/issue however, and we're working on a mitigation for it.