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Despite the extension's page here saying that it works with TB versions 128.0 - 140.0, when I try to install it in my in 140 TB refuses to install it and says:

about:addons

Filter on Folder Button could not be installed because it is not
compatible with Thunderbird 140.0.

这个评论是针对附加组件的一个早期版本的(1.6.2)。  对这个附加组件,此用户曾发表过1个评价。