User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.6) Gecko/20091201 Firefox/3.5.6 Build Identifier: Mozilla/5.0 (Windows; U; Windows NT 5.1; de; rv:1.9.1.5) Gecko/20091204 Lightning/1.0b1pre Thunderbird/3.0 When I open a new tab, for example the Lightning calendar, a mail that I searched for etc., I am unable to close that tab by pressing the standard key combination Ctrl-F4. When I do that, nothing at all happens. As there are probably quite some users out there who are faster with a keyboard than with a mouse, I think it should be fixed as a) the key combination really _is_ standard and b) it might make working with TB 3 a lot faster in some cases. Any advice is much appreciated. Reproducible: Always Steps to Reproduce: 1. Open message in new tab 2. Press Ctrl-F4 3. Nothing happens Actual Results: Nothing as explained above :) Expected Results: TB should have closed the tab.