The whole point of Firefox _is_ to make network requests. All of the features above aren't leaking your user data or fingerprinting you, they're assisting you in what the applications purpose is... to make network requests. Not to mention firefox is an open-source project, so you could go look at all the network communication it makes when it starts up. All of these options are configurable anyways.
I think you're looking in the wrong direction. Try the closed-source (or partial closed source) operating systems you interact with on a daily basis: Windows, Android, macOS, iOS- that's where you'll find the "fingerprinted and tracked every single time you open" sort of thing you speak of. :)