Examine source code of Back Track

{
  "theme": {
    "images": {
      "theme_frame": "BT.png"
    },
    "colors": {
      "frame": "#424242",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Back Track",
  "manifest_version": 2,
  "description": "Backtrack Custom Green\n-My first attempt at \"art.\""
}