Using FF 5.0, '''when I click on a blank area within Panorama Tab Group, the entire tab group simply DISAPPEARS!!! '''And, to make matters worse, no "undo" button shows up to reverse this! From reading other user comments, it seems that the tab group feature does not adequately provide (1) undo capability nor (2) CONFIRMATION that you really want to close/eliminate that tab group. There should also be a way to recover an entire tab group in the History drop down, but apparently tabs (URLs) can only be recovered one by one, and that is only if the URL has an easily identifiable descriptor. This whole thing makes it difficult to safely use the Panorama feature!