Another observation: If the message preview is switched on, one **can** tab off the message list. It tabs into the header of the message in the preview pane. So it looks like the hidden element is blocking it.
Bug 1561288 Comment 2 Edit History
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Another observation: If the message preview is switched on, one **can** tab off the message list. It tabs into the header of the message in the preview pane. So it looks like the collapsed element is blocking it. ``` <hbox xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul" id="msgHeaderView" class="main-header-area" collapsed="true"> ```