Examine source code of Animated Netscape

{
  "manifest_version": 2,
  "version": "1.0",
  "name": "Animated Netscape",
  "theme": {
    "images": {
      "additional_backgrounds": [
        "images/0.png"
      ]
    },
    "properties": {
      "additional_backgrounds_alignment": [
        "right top"
      ],
      "additional_backgrounds_tiling": [
        "no-repeat"
      ]
    },
    "colors": {
      "toolbar": "rgb(175, 204, 204)",
      "toolbar_text": "rgb(11, 97, 115)",
      "frame": "rgb(108, 156, 158)",
      "tab_background_text": "rgb(222, 229, 230)",
      "toolbar_field": "rgb(225, 246, 255)",
      "toolbar_field_text": "rgb(0, 0, 0)",
      "tab_line": "rgb(88, 200, 221)",
      "popup": "rgb(236, 236, 236)",
      "popup_text": "rgb(0, 0, 0)",
      "tab_loading": "rgb(88, 200, 221)"
    }
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3577220-cc30-49d9-a31e-61a2084cdd16}"
    }
  }
}