Many websites are now showing "Sign in with Google" popups.
If you find these popups annoying (and why wouldn't you?), the good news is that they can be stopped with StopTheMadness. The custom <style> element feature of StopTheMadness allows you to add your own CSS to any website. Below is the CSS to hide Sign in with Google.
div#credential_picker_container > iframe[src^="https://accounts.google.com/"],
iframe#credential_picker_iframe[src^="https://accounts.google.com/"]
{ display: none !important; }
Both StopTheMadness for Mac and StopTheMadness for iOS have the custom <style> element feature, and the CSS is the same for both. You can even sync settings between the two versions with iCloud.
By the way, my previous article explained how to hide Google Doodles, as well as "Google recommends using Chrome" popups. Wow, Google sure is busy littering your screens.
In other news, I was thrilled to read today that Zac Hall of 9to5Mac included StopTheMadness in his list, These apps and extensions make my Mac work. Thank you, Zac!