Examine source code of Wednesday No.2

{
  "name": "Wednesday No.2",
  "manifest_version": 2,
  "version": "2.0",
  "theme": {
    "images": {
      "theme_frame": "wedn-5.png"
    },
    "colors": {
      "frame": "rgba(31, 72, 166, 0.8)",
      "tab_background_text": "rgba(255, 255, 255, 1)",
      "toolbar": "rgba(47, 21, 69, 0.4)",
      "bookmark_text": "rgba(255, 255, 255, 1)",
      "toolbar_field": "rgba(186, 136, 18, 0.16)",
      "toolbar_field_text": "rgba(255, 255, 255, 1)",
      "tab_line": "rgba(0, 0, 0, 1)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{92d4bdde-1bce-41d3-9dee-912400786f6a}"
    }
  }
}