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Thanks for the add on. You can add a function: completely clear the To, CC, BCC fields? Sometimes there are a lot of recipients in these fields and it is not convenient to delete them one by one.

这个评论是针对附加组件的一个早期版本的(1.1)。 

It is implemented as a function of Thunderbird itself.
Although it is not displayed in the To field, Cc and Bcc are marked with a ✖ mark on the left side of the field and can be deleted together with the field (when you move the cursor to the ✖ mark, "Remove the Cc filed" or "Remove the Bcc filed" It shows).
Is this no good?