In Firefox, if I click on a tab element/button, it selects that tab, if I then do something like select all, it will select everything in that tab. In Thunderbird, if I open a message tab and select the tab element/button, I have to select the message pane for select all to work. It feels like we should be focusing on the message pane by default or not allowing focus on tabs. (This is split out from bug 502681 which found this initially.)
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