Examine source code of Colour polygons

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Colour polygons",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.jpg"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "center top"
      ],
      "additional_backgrounds_tiling": [
        "repeat"
      ]
    },
    "colors": {
      "toolbar": "rgba(201, 201, 201, 0.8)",
      "toolbar_text": "rgb(54, 54, 54)",
      "frame": "rgb(128, 128, 128)",
      "tab_background_text": "rgb(0, 0, 0)",
      "toolbar_field": "rgb(255, 255, 255)",
      "toolbar_field_text": "rgb(54, 54, 54)",
      "tab_line": "rgb(128, 128, 128)",
      "popup": "rgb(201, 201, 201)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(128, 128, 128)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{77c46233-9053-414a-b682-2abb3aa59cab}"
    }
  }
}