I suspect the core issue isn't that you can't disable new privacy violations in Firefox, but that they're regularly added and default to being enabled, such that keeping them disabled is a regular full-time job. It'd be ideal if there was a single "don't phone home" switch that Firefox obeyed for all new telemetry features, but they don't.

That being said, being upset Mozilla has a trash telemetry policy isn't a good excuse to use Chrome, a willfully compromised browser which has refused to implement industry-standard protections.

It is problematic that phoning home is opt-out to begin with. A browser can not call itself privacy respecting if it is not zero telemetry by default.

You can also disable phoning home in Chromium.