This does hide the obnoxious google sign in notification, but it also makes that part of the browser in the upper right corner unclickable when there is a google sign in that it's hiding.

Does not work at all.
For example;
avsforum .com /forums/subwoofers-bass-and-transducers.113/
Also wetransfer website

doesn't work - Google Sign In popup still there

Does exactly what it says