Jpm-mobile, Doesn't work xpi in Firefox nightly on android

Add-ons Development
#1

I try to create simple xpi example. In my project folder I run “jpm init” command and changed code in index.js on this:

var menuId;

function loadIntoWindow(window) {
if (!window)
return;
menuId = window.NativeWindow.menu.add(“View Source”, null, function() {
viewSource(window);
});
}

function unloadFromWindow(window) {
if (!window)
return;
window.NativeWindow.menu.remove(menuId);
}
Xpi installed correctly, but menu item doesn’t appear. What wrong in code?