Examine source code of Masquerade Mask

{
  "theme": {
    "images": {
      "theme_frame": "Masquerade.jpg"
    },
    "colors": {
      "frame": "#b4b4b4",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Masquerade Mask",
  "manifest_version": 2,
  "description": "A masquerade ball (or bal masqué) is an event which the participants attend in costume wearing a mask."
}