Examine source code of Happy Duck

{
  "manifest_version": 2,
  "name": "Duck",
  "version": "1.0",
  "description": "A simple duck Firefox theme.",
  "theme": {
    "colors": {
      "frame": "#3A1412",
      "toolbar": "#394553",
      "toolbar_text": "#F4E9DF",
      "tab_background_text": "#E8D4C4",
      "tab_selected": "#342421",
      "tab_text": "#FFF4EA",
      "icons": "#E7C5A9",
      "icons_attention": "#F29A4A",
      "button_background_hover": "#49312C",
      "button_background_active": "#5A342B",
      "toolbar_field": "#171313",
      "toolbar_field_text": "#F7EDE5",
      "toolbar_field_border": "#68423A",
      "toolbar_field_focus": "#211817",
      "toolbar_field_border_focus": "#D9783D",
      "popup": "#211A19",
      "popup_text": "#F4E9DF",
      "popup_border": "#563730",
      "popup_highlight": "#713A2B",
      "popup_highlight_text": "#FFF7F0",
      "sidebar": "#1D1716",
      "sidebar_text": "#EEDFD3",
      "sidebar_border": "#49302B",
      "ntp_background": "#181313",
      "ntp_text": "#F1E5DB"
    },
    "images": {
      "theme_frame": "images/duck-bg.png"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{dd28ec03-1731-4f70-a636-80d9f3f00a39}"
    }
  }
}