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No button. Nothing. But this is experimental so maybe down the road...

이 검토는 현재 부가 기능의 이전 (0.2) 버전에 대한 것입니다. 

I tested with 102.8.0, and the button can be elusive. It seems to have problems with remote addressbooks, like CardDAV. When a remote update changes the displayed contact, the button goes away.
I should be able to detect that refresh and redisplay the button.