What is telemetry. What is its function. Its function is to share information with Mozilla. Without telemetry, Mozilla does not have access to this information.

But what if the computer user does not care to share information with Mozilla.

Information such as:

(a) IP address

(b) the software is used/when the user is online

(c) the user's preferred websites

(d) how the software is used

(e) settings the user changes or does not change

and so on.

This is information sharing with Mozilla by default. It is not "opt-in". It is "op-out".