Examine source code of Transparency v.2

{
  "theme": {
    "images": {
      "theme_frame": "bg.png"
    },
    "colors": {
      "frame": "#bbbbbb",
      "tab_background_text": "#bbbbbb"
    }
  },
  "version": "2.0",
  "name": "Transparency v.2",
  "manifest_version": 2,
  "description": "test version"
}