Examine source code of Nicodou

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "niconico",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(219, 220, 219)",
      "toolbar_text": "rgb(136, 141, 129)",
      "frame": "rgb(201, 197, 197)",
      "tab_background_text": "rgb(245, 78, 41)",
      "toolbar_field": "rgba(255, 255, 255, 0.7)",
      "toolbar_field_text": "rgb(132, 168, 67)",
      "tab_line": "rgb(245, 75, 41)",
      "popup": "rgb(219, 220, 219)",
      "popup_text": "rgb(87, 120, 33)",
      "tab_loading": "rgb(245, 75, 41)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{56799d01-757a-4663-9908-bf386b284cec}"
    }
  }
}