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I like this theme a lot and use it wherever I use SeaMonkey as my browser.
The only problem is that the SeaMonkey Help window lacks a titlebar when this theme is enabled.

EDIT:
The problem is only in 2.47 and up. If you look up the XPFE-Classic theme on GitHub you'll see how to fix it.

What do you mean "SeaMonkey Help window lacks a titlebar"? I have checked the help window (F1) and it looks just the same way like in Seamonkey Default Theme, nothing is missing.
Can you describe more precisely what "titlebar" do you find missing?