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Still no Themes support in Thunderbird :( adding the lightweightThemes.forceSkinning setting didn't help either.
Just can't live without my beloved Mostly Crystal - the default icons are just good enough. Why do you not include a "Enable Themes" option in the Personas UI?
Personas doesn't do very much - doesn't skin the menus, the Add-On and Preferences windows etc. etc. - why is it disabling the much more powerful (and much more thought through) Themes?