Examine source code of modified zelda

{
  "name": "Zelda",
  "manifest_version": 2,
  "version": "1.0",
  "theme": {
    "images": {
      "theme_frame": "header2.png"
    },
    "colors": {
      "frame": "rgba(28, 27, 34, 1)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(43, 42, 51, 0.56)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(30, 29, 36, 0.5)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(255, 255, 255, 0)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c99ffd3a-c389-4649-93a8-30630b9cf36d}"
    }
  }
}