Examine source code of Snowflakes flying

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Snowflakes flying",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(211, 243, 255, 0.5)",
      "toolbar_text": "rgb(0, 82, 145)",
      "frame": "rgb(76, 203, 220)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(0, 39, 99)",
      "tab_line": "rgb(0, 255, 215)",
      "popup": "rgb(255, 255, 255)",
      "popup_text": "rgb(0, 102, 172)",
      "tab_loading": "rgb(0, 255, 215)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c3f6c2f1-50c5-4b39-b609-ba4cb8bf700b}"
    }
  }
}