That's not one of my scripts. It's your own Hive Keychain extension injecting its content script into the page. Your blocker treats extension-injected scripts as third-party and blocks them by default. The site needs window.hive_keychain to exist to offer login/signing, so it stalls until you allow it. Allowing it just lets your extension talk to the page; nothing is sent anywhere.

However you do point out that a slight change should prevent total site-blocking simply because Hive Keychain is assumed to be always there, which is for 99% of the internet, not the case.

Thanks!