Comment 20 for bug 22199

Firefox steals the key combination Alt-Tab, used to cycle through currently
running applications, when the URL bar is in drop-down completion mode. It also
appears to steal other alt-related key bindings.

Steps to reproduce:

  1. Load up more than 1 application. Eg. an xterm work-alike of your choice.
  2. Load Firefox
  3. Select the URL bar and start to type 'www.'
  4. As soon as the selection as moved into the drop-down list, press Alt-Tab

Alt-Tab (or Alt-Esc) will now act as though just 'Tab' or just 'Escape' were
pressed.