Examine source code of Fog trees

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Fog trees",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgba(199, 211, 221, 0.5)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(243, 243, 243)",
      "tab_background_text": "rgb(81, 81, 81)",
      "toolbar_field": "rgb(243, 243, 243)",
      "toolbar_field_text": "rgb(83, 34, 0)",
      "tab_line": "rgb(50, 110, 198)",
      "popup": "rgb(225, 225, 225)",
      "popup_text": "rgb(83, 34, 0)",
      "ntp_background": "rgba(199, 211, 221, 0.5)",
      "ntp_text": "rgb(83, 34, 0)",
      "tab_loading": "rgb(50, 110, 198)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{23d43ff7-34e3-4793-b382-989ca7373c82}"
    }
  }
}