I just learned of this:

https://www.ghacks.net/2020/04/09/mozilla-installs-scheduled-telemetry-task-on-windows-with-firefox-75/

https://tinyurl.com/u2by9kl

"According to Mozilla, the task has been created to help the organization "understand changes in default browser settings". At its core, it is a Telemetry task that collects information and sends the data to Mozilla.

The data is sent to Mozilla every 24 hours using the scheduled task."

--- Thunderbird 2.0.0.24 (Windows/20100228)
* Origin: nntp://rbb.fidonet.fi - Lake Ylo - Finland (2:221/360.0)