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After applying the latest update (carbook 20.7) the close, minimize and maximize buttons are gone. Disabling cardbook and the buttons are back.

Is anyone else experimenting this problem?

Thanks.

UPDATE: I would like to congratulate the developer to give such a great support. The issue will be fixed in the upcoming update, I assume it will be rolled-out soon. In the meantime he also provided with a temporary solution.

这个评论是针对附加组件的一个早期版本的(20.7)。  对这个附加组件,此用户的其他评论

have you got errors in your console (CTRL+SHIFT+J) ? (cardbook.thunderbird@gmail.com)

problem on mac : solution for the moment :
go to about:config>mail.tabs.drawinTitlebar:
and make from true to false