Nope, nothing will break. I am blocking GA in the following ways: NoScript, PrivacyBadger, Windows HOSTS file. I see the thing being called, and nothing gets through, and websites work properly.
Edit: the bugzilla article mentions both GA and googletagmanager.com, which (both) I have been successfully blocking in the above ways for many years. I never had any website not working because of those two pieces.
Edit: "we are scum. We want to ** your privacy any way we can. We just got hit with a multi-million fine, so we will continue. You want to unsubscribe? Sure, be tracked a bit more while at it." /end-rant
Only anecdotal, and no longer happening: The top menu on https://www.easyjet.com/en/ used to break if you disabled Google Analytics, the submenu just wouldn't appear.
Nope, nothing will break. I am blocking GA in the following ways: NoScript, PrivacyBadger, Windows HOSTS file. I see the thing being called, and nothing gets through, and websites work properly.
Edit: the bugzilla article mentions both GA and googletagmanager.com, which (both) I have been successfully blocking in the above ways for many years. I never had any website not working because of those two pieces.