I'm trying Gnome Shell, after moving over from Unity. In Unity, I'd press ctrl+w to close the current tab, and alt+F4 to close the current window (e.g. in gedit and Firefox).
Now, in Gnome Shell, ctrl+w is closing the current window instead, and alt+F4 does nothing. I've checked the menu of Firefox, and it says File > Close Tab is ctrl+w as expected. Selecting this item works also.
When I right click my menubar, the minimise/maximise popup menu appears. The last menu-item is "Close", with the associated keyboard shortcut of ctrl+w. Presumably this overrides the application-specific "Close tab" shortcut. I checked System Settings > Keyboard > Shortcuts and "Close Window" was set to "Disabled", so I'm not sure what's going on there...
How can I restore the expected behaviour?