Spybot Anti-Beacon 3.9 was released just a month ago, but Mozilla Firefox Telemetry settings seems to be from 2018 when this protection has been initially added.

I checked the description of the "Mozilla Firefox Telemetry (via Configuration)" immunzer: Customize -> Browser -> Mozilla Firefox Telemetry (via Configuration) -> Entry Information for the technically inclined user. It appears that 7 out of 28 entries listed don't exist in the latest version of Mozilla Firefox when you type about:config. Is that ok?