User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.8; rv:9.0.1) Gecko/20100101 Firefox/9.0.1 Build ID: 20111220165912 Steps to reproduce: Pressed CMD-Q on OSX by mistake when trying to enter the AT sign. Actual results: Firefox just quit, causing me to lose approx. 1000 words when filing a feature request for XCode over at bugreport.apple.com. Expected results: Firefox, just like Safari does, should have asked me whether I really wanted to quit the application when pressing CMD-Q. This may also apply to other platforms where you can close the application or the current window/tab using different keyboard shortcuts.