Examine source code of Orange-Forest-Sunset

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "#fac519",
      "tab_background_text": "#6b3900"
    }
  },
  "version": "2.0",
  "name": "Orange-Forest-Sunset",
  "manifest_version": 2,
  "description": "Picture taken by me in California, and created to enhance the beauty of your Firefox. (c)"
}