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It appears to be related to sign-in flow[1], but may not affect signing in via Google.com or other Google-hosted services directly. It's the API for "Sign in with Google", far as I can tell here.

[1]: https://developers.google.com/identity/gsi/web

Thanks

For medium I recommend just blocking Javascript.

No signup popups, fast loads.

If you go to https://myaccount.google.com/permissions, you can turn off "Google Account sign-in prompts" on each of your Google Accounts and then you won't see any more of those prompts.

Don't know if Facebook has a similar option for their accounts though; I've seen a similar sign-in prompt elsewhere for Facebook.

The Sign in with Google dialog even shows for me, a logged in user..