Examine source code of Pure Paper

{
  "name": "Pure Paper",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "216327162f6778152aa11413048b848d.jpg"
    },
    "colors": {
      "frame": "rgba(229, 230, 232, 1)",
      "tab_background_text": "rgba(0, 0, 0, 0.72)",
      "toolbar": "rgba(0, 0, 0, 0.18)",
      "toolbar_field": "rgba(252, 252, 252, 0.61)"
    }
  }
}