Examine source code of Feliz Halloween

{
  "theme": {
    "images": {
      "theme_frame": "Halloween-GC.jpg"
    },
    "colors": {
      "frame": "#3208f0",
      "tab_background_text": "#15086e"
    }
  },
  "version": "2.0",
  "name": "Feliz Halloween",
  "manifest_version": 2,
  "description": "Pasa un feliz halloween!"
}