Examine source code of Black Forest Cookie theme

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Black Forest Cookie !",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png",
        "images/1.png",
        "images/2.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "left center",
        "right center",
        "left center"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "no-repeat",
        "repeat-x"
      ]
    },
    "colors": {
      "toolbar": "rgb(57, 35, 33)",
      "toolbar_text": "rgb(226, 35, 58)",
      "frame": "rgb(192, 109, 119)",
      "tab_background_text": "rgb(255, 238, 242)",
      "toolbar_field": "rgb(226, 212, 206)",
      "toolbar_field_text": "rgb(242, 71, 88)",
      "tab_line": "rgb(150, 0, 31)",
      "popup": "rgb(255, 254, 247)",
      "popup_text": "rgb(156, 0, 37)",
      "tab_loading": "rgb(150, 0, 31)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{0c209dc3-8bbd-49b8-b161-d4a77d612e4f}"
    }
  }
}