Combined with "--app=URL", "--single-app" will replace the
URL of an existing browser window, instead of opening a new one.
If no existing browser window is open, "--single-app" is a no-op
and a new browser window will open.

Example:

   # Open a browser in full screen, app mode (e.g. a "kiosk")
   midori -e fullscreen -a https://www.google.com

   # Replace the webpage shown on the existing browser
   midori --single-app -a https://www.yahoo.com

Complementary to '-e fullscreen' which toggles fullscreen mode,
this command always turns full-screen mode (or no-op if already
in full screen mode).
This is useful for kiosk mode, especially with changing the kiosk
webpage display from the command line.

Example:

  midory -e force-fullscreen -a https://www.yahoo.com