Examine source code of colorbaby etc

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "colorbaby etc",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg",
        "images/1.jpg",
        "images/2.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right center",
        "left bottom",
        "left bottom"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat",
        "repeat",
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(228, 65, 135)",
      "toolbar_text": "rgb(106, 191, 255)",
      "frame": "rgb(130, 193, 15)",
      "tab_background_text": "rgb(238, 255, 104)",
      "toolbar_field": "rgb(255, 179, 55)",
      "toolbar_field_text": "rgb(215, 0, 93)",
      "tab_line": "rgb(255, 215, 42)",
      "popup": "rgb(255, 179, 55)",
      "popup_text": "rgb(228, 117, 0)",
      "tab_loading": "rgb(255, 215, 42)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{f5671a07-32a4-49a6-a2d1-85c081d289fe}"
    }
  }
}