This Chrome-OS-only app changes Crosh to open in a separate window, rather than a browser tab, so that Ctrl-N/T/etc. can pass through to it. Note that for this to work you must, after installing it, right-click the Crosh Window app and select the "Open as window" setting or Ctrl-N/etc. will not be passed through. (If you've forgotten to do this you'll see that the window has a URL bar between the title bar and the terminal pane.)