[sfmz]

Here's a uBlock filter to defeat 'sign-in-with-google' auto-popups

||accounts.google.com/gsi/*$xhr,script,3p

[rchaud]

Does this visually block the text+images from showing up, or does it block the network request altogether?

[chuckadams]

That filter blocks the request outright. A cosmetic filter would have a CSS selector in it after a couple of # signs, and would apply to the site containing the popup.