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No matter what it’s for, there should be a way for concerned users to disable it. I say this as someone who is pro telemetry in general.

There is a way and it's officially documented: https://support.mozilla.org/en-US/kb/telemetry-clientid just go into about:preferences

Again here’s their traffic upon start and exit after doing that https://i.imgur.com/VFb1maZ.png This is no extensions and all telemetry disabled.