Jesus, that is not about Google Analytics on Mozillas websites but on the about:addons page of Firefox. That is terrifying.
That is not the issue. The issue is when they send Firefox user's data to google of all places.
That is terrifying.
Only in the "Get Add-ons" section, mind you. Everything else is local.
Actually it is. It suggests the organization behind the browser actively takes steps to embed tracking right in the browser.
a) I can block it from websites easily. Not so from Firefox about:... pages.
b) Firefox has a marketing angle that they are privacy protecting. But injecting external tracking code into the browser itself is the opposite.
Homebrew also has it included with a pretty good description why I think: https://github.com/Homebrew/brew/blob/master/docs/Analytics....
That should be a whole lot more terrifying.