Examine source code of Netscape Wheel

{
  "manifest_version": 2,
  "version": "3.0",
  "name": "Netscape Wheel",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(135, 185, 194)",
      "toolbar_text": "rgb(0, 0, 0)",
      "frame": "rgb(2, 54, 64)",
      "tab_background_text": "rgb(155, 215, 226)",
      "toolbar_field": "rgb(222, 239, 241)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(204, 219, 221)",
      "popup": "rgb(204, 219, 221)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(204, 219, 221)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{523a4eb5-5b27-44e1-a2c0-6bd1bb8a5873}"
    }
  }
}