Examine source code of Skulldrum

{
  "theme": {
    "images": {
      "theme_frame": "rm01.jpg"
    },
    "colors": {
      "frame": "#ffffff",
      "tab_background_text": "#3d3d3d"
    }
  },
  "version": "2.0",
  "name": "Skulldrum",
  "manifest_version": 2,
  "description": "Skull with sunglasses and beard over iron cross over my snaredrum + drumsticks - actually a picture i made for my first tattoo"
}