crash.js

// open scratchpad, switch to chrome environment & exectue.

let Ci = Components.interfaces;
let Cc = Components.classes;

let addonPrincipal = Cc["@mozilla.org/systemprincipal;1"].
                     createInstance(Ci.nsIPrincipal);
                     
let docShell = Cc["@mozilla.org/appshell/appShellService;1"].
                getService(Ci.nsIAppShellService).
                createWindowlessBrowser().
                QueryInterface(Ci.nsIInterfaceRequestor).
                getInterface(Ci.nsIDocShell);

docShell.createAboutBlankContentViewer(addonPrincipal);

let window = docShell.contentViewer.DOMDocument.defaultView;
window.location = "data:application/vnd.mozilla.xul+xml;charset=utf-8,<window/>";