Why do you assume it's necessary? FWIW, I'd rate quite a bit of what it does as "not necessary".

On another thread, I was told: "Firefox is feeding your data to Google. You need to disable it in the user.js file"

To google? Other than it being the default search engine, highly doubt.

And those “home calls” are nothing more than calls like whether you are on the public internet, whether a new update is available and other mundane things.

AFAIK Mozilla uses Google services for some telemetry. But that's exactly the kind of thing that warrants detailed consideration and not just "there's traffic touching a Google IP, THEY ARE FEEDING DATA TO GOOGLE!" and random scripts from the internet that disable IPv6 "against tracking"

Oh, some random stranger on the Internet said so? That must be right, then.

I was not proclaiming that it was a fact. I am openly frustrated and confused. An oft repeated claim is that "people just don't care about their privacy." I am moderately technical and I am totally unsure of how to keep my data from these parasite companies. Achieving privacy is incredibly arcane and confusing. Instead of quipping at me with a low value post, why don't you tell me exactly what Mozilla's telemetry does? Do you know?

If you want to know about Mozilla's telemetry, you could start with https://support.mozilla.org/en-US/kb/telemetry-clientid and its links to additional details.

Perhaps these indicate data leakage?

>Searches: Firefox sends Mozilla what you type into the search bar and Mozilla may share that data with its partners.

>Sites you visit: For the Suggestions you click, Firefox sends Mozilla the website URL, and Mozilla may share that data with its partners.

Interesting that turning off "suggestions" is not located in the "privacy" section.