Examine source code of Half Moon Evening

{
  "theme": {
    "images": {
      "theme_frame": "halfmoonevening_header.JPG"
    },
    "colors": {
      "frame": "#3f3f40",
      "tab_background_text": "#000000"
    }
  },
  "version": "2.0",
  "name": "Half Moon Evening",
  "manifest_version": 2,
  "description": "moon, sky"
}