Examine source code of powder clouds

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "powder clouds",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(216, 164, 152)",
      "toolbar_text": "rgb(99, 51, 50)",
      "frame": "rgb(243, 223, 223)",
      "tab_background_text": "rgb(140, 89, 87)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(99, 51, 50)",
      "tab_line": "rgb(216, 164, 152)",
      "popup": "rgb(248, 237, 236)",
      "popup_text": "rgb(140, 89, 87)",
      "ntp_background": "rgb(243, 223, 223)",
      "toolbar_bottom_separator": "rgb(216, 164, 152)",
      "toolbar_field_border_focus": "rgb(255, 255, 255)",
      "toolbar_top_separator": "rgb(216, 164, 152)",
      "tab_loading": "rgb(216, 164, 152)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{60368394-e1bf-4f27-b657-d7280eadc396}"
    }
  }
}