Examine source code of Valhalla Gaming 2.0

{
  "theme": {
    "images": {
      "theme_frame": "header3.png"
    },
    "colors": {
      "frame": "#bdbdbd",
      "tab_background_text": "#e0dddd"
    }
  },
  "version": "2.0",
  "name": "Valhalla Gaming 2.0",
  "manifest_version": 2,
  "description": "This is for Valhalla."
}