Examine source code of Christmas for firefox

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Christmas for firefox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(249, 85, 85, 0.61)",
      "toolbar_text": "rgb(242, 242, 234)",
      "frame": "rgb(60, 105, 134)",
      "tab_background_text": "rgb(255, 255, 255)",
      "toolbar_field": "rgb(247, 168, 168)",
      "toolbar_field_text": "rgb(48, 2, 2)",
      "tab_line": "rgb(68, 237, 17)",
      "popup": "rgba(249, 85, 85, 0.76)",
      "popup_text": "rgb(234, 237, 240)",
      "ntp_background": "rgba(241, 8, 8, 0.13)",
      "popup_border": "rgba(170, 136, 136, 0.13)",
      "sidebar_border": "rgba(248, 248, 248, 0.87)",
      "sidebar_text": "rgba(249, 243, 243, 0.87)",
      "sidebar": "rgb(237, 95, 95)",
      "tab_background_separator": "rgba(249, 243, 243, 0.87)",
      "tab_loading": "rgb(88, 245, 6)",
      "tab_text": "rgb(24, 25, 23)",
      "toolbar_bottom_separator": "rgba(238, 122, 122, 0.87)",
      "toolbar_top_separator": "rgba(8, 123, 8, 0.87)",
      "toolbar_vertical_separator": "rgb(109, 6, 6)"
    }
  }
}