Debian indeed does this. In release FF has disabled telemetry: https://wiki.debian.org/Firefox
For example, when closing firefox on OpenSUSE Leap 15.6, "pingsender" is launched to collect telemetry:
https://imgur.com/a/k3Nnbbj
It has been there for years. It is also on other distros.
For example, when closing firefox on OpenSUSE Leap 15.6, "pingsender" is launched to collect telemetry:
https://imgur.com/a/k3Nnbbj
It has been there for years. It is also on other distros.