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I think we should all settle down, yes from a user point of view removal not having gmail integration is frustrating, but I suspect from a developer's viewpoint having Thunderbird be upgraded and find your add-on left adrift, requiring ? hours of work to rectify, equally annoying. While I don't really know, isn't some/alot of this development work done by people like you & me? Does he/she really deserve to be slagged off.

这个评论是针对附加组件的一个早期版本的(2.19)。 

It is not fully removed. I just no longer want to deal with google users: https://github.com/jobisoft/TbSync/issues/466