Examine source code of Emerald City

{
  "name": "Emerald City",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "EmeraldCity.jpg"
    },
    "colors": {
      "frame": "#5a7063",
      "tab_background_text": "rgba(140, 255, 207, 1)",
      "toolbar": "rgba(204, 255, 234, 0.13)",
      "bookmark_text": "rgba(204, 255, 233, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0)",
      "toolbar_field_text": "rgba(235, 255, 247, 1)"
    }
  }
}