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The reason of problem that I mentioned was the addon: ConfirmBeforeDelete.
When I updated this addon manually, I overcame the problem.

这个评论是针对附加组件的一个早期版本的(1.2)。 

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I'm using this addon for a long time.
And I'm very happy to use this addon
But after v45.2.0 upgrade of Thunderbird,
It's not working.
I guess there is some conficts with new version of TB.
Could you please check

PS:
My OS = Ubuntu 16.04

这个评论是针对附加组件的一个早期版本的(1.2)。