Examine source code of Legend of Zelda Runes

{
  "name": "Legend of Zelda Runes",
  "manifest_version": 2,
  "version": "3.0",
  "theme": {
    "images": {
      "theme_frame": "theme_toolbar.png"
    },
    "colors": {
      "frame": "rgba(8, 8, 8, 1)",
      "tab_background_text": "rgba(217, 181, 21, 1)",
      "toolbar": "rgba(15, 15, 15, 0)",
      "bookmark_text": "rgba(55, 150, 0, 1)",
      "toolbar_field": "rgba(0, 0, 0, 0.49)",
      "toolbar_field_text": "rgba(212, 190, 190, 1)"
    }
  }
}