Examine source code of Deus Ex Day

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Deus Ex Day",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(255, 230, 0, 0.24)",
      "toolbar_text": "rgb(112, 92, 51)",
      "frame": "rgb(132, 133, 138)",
      "tab_background_text": "rgb(109, 109, 129)",
      "toolbar_field": "rgba(255, 242, 124, 0.77)",
      "toolbar_field_text": "rgb(53, 20, 9)",
      "tab_line": "rgba(255, 230, 0, 0.82)",
      "popup": "rgb(255, 246, 159)",
      "popup_text": "rgb(129, 67, 0)",
      "button_background_hover": "rgba(255, 230, 0, 0.82)",
      "icons_attention": "rgba(77, 77, 255, 0.82)",
      "popup_highlight": "rgb(53, 20, 9)",
      "tab_selected": "rgba(255, 230, 0, 0.82)",
      "toolbar_field_highlight": "rgba(0, 0, 0, 0.33)",
      "toolbar_top_separator": "rgba(255, 0, 0, 0)",
      "tab_loading": "rgba(255, 230, 0, 0.82)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{11c2d101-1ce8-40c9-8868-75bb71483517}"
    }
  }
}