Oceniono na 1 z 5 możliwych gwiazdek

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

Ta opinia jest o wcześniejszej wersji dodatku (0.2). 

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.