The notifications Signal pops up, with contact name and message text, are generated from within the app itself, not sent via Google. It does receive some Fireb

The notifications Signal pops up, with contact name and message text, are generated from within the app itself, not sent via Google. It does receive some Firebase messages from Google, but not the type that automatically pops up a notification. Instead these are silent ones that trigger the app to perform a particular action, such as fetching any new Signal messages from Signal's servers.