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some Themes don't work with the current TB 17 in this case you can try "Titlebar Tabs Cleaner"
https://addons.mozilla.org/en-us/thunderbird/addon/titlebar-cleaner/

此意見為舊版本 (3.42) 的附加元件。 

Thanks for the info Mark.For other users : With Titlebar cleaner, Noia2 theme works with TB 17. Nevertheless, you'll have to adapt inside the xpi file, three install.rdf files to support the TB max version. Put 17.*, it's OK.And of course, you'll have to accept a few visual bugs. I work on an update. Be patient ...