Mozilla/5.0 (Macintosh; Intel Mac OS X 10.6; rv:2.0b7pre) Gecko/20100914 Firefox/4.0b7pre If an App Tab is selected in the browser window and TabView is opened, it cannot be closed anymore with the escape key or the exit button. I think the reason is that app tabs don't get the focus right now and TabView can only be closed with a normal tab selected? There shouldn't be a difference between normal tabs and app tabs.

Found while running one of our PoC Mozmill tests.

I believe this is due to bug 596781.

Just a note. Given this bug we still have a normal tab open. Bug 596781 is for a situation when only app tabs are open. So I wonder if we shouldn't mark it dependent. Sorry for some missing steps in comment 0. So here again: 1. Start Minefield with one normal tab open 2. Open a new tab by Cmd/Ctrl+T 3. Pin the blank tab as app tab 4. Enter TabView with Alt/Ctrl+Space 5. Hit shortcut again to leave TabView