Examine source code of Keyboard Remix

{
  "theme": {
    "images": {
      "theme_frame": "KeyRemix-Header.jpg"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffffff"
    }
  },
  "version": "2.0",
  "name": "Keyboard Remix",
  "manifest_version": 2,
  "description": "A pop of colour added to electronic keyboard keys. The green bars are the graphic representation of sound waves, similar to what you'd see on recording equipment."
}