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mail.tabs.drawInTitlebar=false seems to be what you search for?

Questa recensione riguarda una versione precedente (1.0.2.0) del componente aggiuntivo. 

Sadly a theme cannot set this config, as it cannot deliver prefs nor inject scripts. Or is there a way I missed?However I use that config personally for now, I have a version ready with all other issues fixed :(

Edit: Fixed now, downloadable via changelog and after review.