Examine source code of Hamradio lookups

{
  "manifest_version": 2,
  "name": "Hamradio lookups",
  "version": "3.1.4",
  "description": "QRZ Ham radio lookups. QRZ.com, HamQTH.com, QRZCQ.com, HamCall.net, HamData.com, QRZ.ru",
  "homepage_url": "https://ruqrz.com",
  "icons": {
    "48": "icons/app-48.png"
  },
  "permissions": [
    "tabs"
  ],
  "browser_action": {
    "browser_style": false,
    "default_icon": "icons/app-32.png",
    "theme_icons": [
      {
        "light": "icons/app-32-light.png",
        "dark": "icons/app-32.png",
        "size": 32
      }
    ],
    "default_title": "HamRadio Lookups",
    "default_popup": "popup/chooser.html"
  }
}