Examine source code of heartless

{
  "theme": {
    "images": {
      "theme_frame": "xD.JPG"
    },
    "colors": {
      "frame": "#3091d1",
      "tab_background_text": "#a9e02a"
    }
  },
  "version": "2.0",
  "name": "heartless",
  "manifest_version": 2,
  "description": "xD"
}