Examine source code of Page test

{
  "theme": {
    "images": {
      "theme_frame": "MarvinBrouser.jpg"
    },
    "colors": {
      "frame": "#b53e3e",
      "tab_background_text": "#171313"
    }
  },
  "version": "2.0",
  "name": "Page test",
  "manifest_version": 2,
  "description": "Page test"
}