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DO NOT INSTALL! Previous "Deselect on Delete" did not require any permissions. This version wants "full, unrestricted access to Thunderbird and your computer."

There is no reason for this add-on to require such broad permissions. Seems like a backdoor.

这个评论是针对附加组件的一个早期版本的(3.1)。 

It's not a backdoor. You can unzip the extension and look at the code, it's small and clear. Requiring this permission is needed to use "experiments" API. Previous addon required same permission. Btw when installed, both will show "This extension doesn’t require any permissions", it's mozilla bug.