Examine source code of HostedDialer

{
  "theme": {
    "images": {
      "theme_frame": "hdtop.jpg"
    },
    "colors": {
      "frame": "#0f0e0e",
      "tab_background_text": "#f78e1e"
    }
  },
  "version": "2.0",
  "name": "HostedDialer",
  "manifest_version": 2,
  "description": "Hosted Dialer, the leading Hosted Dialer Solution."
}