Examine source code of Falling Snow Animated

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Falling Snow Animated",
  "description": "Falling Snow Animated Theme For Firefox",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(0, 0, 0, 0)",
      "toolbar_text": "rgb(161, 169, 202)",
      "frame": "rgb(2, 4, 18)",
      "tab_background_text": "rgb(161, 169, 202)",
      "toolbar_field": "rgb(19, 21, 38)",
      "toolbar_field_text": "rgb(184, 192, 227)",
      "tab_line": "rgba(161, 169, 202, 0.6)",
      "popup": "rgb(19, 21, 38)",
      "popup_text": "rgb(161, 169, 202)",
      "frame_inactive": "rgb(2, 4, 18)",
      "icons_attention": "rgb(107, 135, 255)",
      "ntp_background": "rgb(2, 4, 18)",
      "ntp_text": "rgb(161, 169, 202)",
      "popup_border": "rgba(161, 169, 202, 0.6)",
      "popup_highlight_text": "rgb(233, 236, 248)",
      "popup_highlight": "rgba(161, 169, 202, 0.15)",
      "sidebar_border": "rgba(161, 169, 202, 0.6)",
      "sidebar_highlight_text": "rgb(233, 236, 248)",
      "sidebar_highlight": "rgba(161, 169, 202, 0.15)",
      "sidebar_text": "rgb(161, 169, 202)",
      "sidebar": "rgb(19, 21, 38)",
      "tab_background_separator": "rgba(161, 169, 202, 0.6)",
      "tab_selected": "rgba(161, 169, 202, 0.15)",
      "tab_text": "rgb(233, 236, 248)",
      "toolbar_bottom_separator": "rgba(161, 169, 202, 0.15)",
      "toolbar_field_border_focus": "rgba(0, 0, 0, 0)",
      "toolbar_field_border": "rgba(161, 169, 202, 0.6)",
      "toolbar_field_highlight_text": "rgb(233, 236, 248)",
      "toolbar_field_highlight": "rgba(161, 169, 202, 0.15)",
      "toolbar_field_text_focus": "rgb(233, 236, 248)",
      "toolbar_top_separator": "rgba(161, 169, 202, 0.15)",
      "toolbar_vertical_separator": "rgba(0, 0, 0, 0)",
      "tab_loading": "rgba(161, 169, 202, 0.6)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "falling-snow-animated@pro-bandey.com"
    }
  }
}