Examine source code of Oliver Vocaloid 3

{
  "theme": {
    "images": {
      "theme_frame": "oliver.png"
    },
    "colors": {
      "frame": "#000000",
      "tab_background_text": "#ffc800"
    }
  },
  "version": "2.0",
  "name": "Oliver Vocaloid 3",
  "manifest_version": 2,
  "description": "Yaay! This is the first Oliver persona out there!! :3 I worked really hard on this, I hope you enjoy!! ^^"
}