This is great news... Unfortunate as I used to be bullish on browser based push notifications, but in reality they were never working reliably on mobile devices.

I use a web API for my SMS gateway, and implemented push notifications via Firebase. It didn't matter whether I was using Fennec/Firefox, Chrome, or Vivaldi, I would always cease to be notified the moment the browser was killed off by my phone.

I eventually got sick of it and ported the logic over to call ntfy.sh instead. Not a single missed message since.