Thunderbird userChrome.css code

Curiosity

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Is there any stylesheet code that can specify a folder being not empty? I was trying to get the Deleted (Trash) folder in the email accounts to change colour when it has any content in TB3, and I have been unable to find anything about distinguishing empty folders from non-empty ones. There must be a way to do that. TB2 used to do that with the Deleted folder, but TB3 does not.
I tried
treechildren::-moz-tree-cell-text(folderNameCol, specialFolder-Trash, not-empty)
but not-empty does not work. What is the proper syntax?
 
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