Examine source code of Extreme Networks

{
  "theme": {
    "images": {
      "theme_frame": "header.png"
    },
    "colors": {
      "frame": "rgba(229,230,232,1)",
      "tab_background_text": "#ccccff"
    }
  },
  "version": "2.0",
  "name": "Extreme Networks",
  "manifest_version": 2,
  "description": "A fan-created theme for Extreme Networks - <a rel=\"nofollow\" href=\"https://outgoing.prod.mozaws.net/v1/bc66b8a9bb13cd5a59622e56ff2f629ec651503528ba09ce93ed2ad83a16dd0d/http%3A//www.extremenetworks.com\">http://www.extremenetworks.com</a>\n\nNote: This theme is designed to be used with a visible Menu Bar, which is hidden by default! Tap your ALT key and choose View &gt; Tool Bars &gt; Menu Bar."
}