Chrome has it built into the browser. If you fake the Chrome user agent string from Firefox, it'll also not show up (but you shoot yourself in the foot in other ways so I'm not advising that). Or so I heard on Mastodon a few days ago iirc

This also means that Google made it unblockable in Chrome. User scripts and extensions cannot block a browser UI feature... I guess thankfully you haven't logged in on the browser and it's clever enough not to spam it then