Examine source code of gibraltar sunset

{
  "theme": {
    "images": {
      "theme_frame": "headergibraltar.jpg"
    },
    "colors": {
      "frame": "#edc121",
      "tab_background_text": "#eddc9f"
    }
  },
  "version": "2.0",
  "name": "gibraltar sunset",
  "manifest_version": 2
}