Examine source code of ip2location

{
  "manifest_version": 2,
  "name": "ip2location",
  "description": "find ip's location via selection",
  "version": "1.0",
  "browser_specific_settings": {
    "gecko": {
      "strict_min_version": "56.0a1"
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "permissions": [
    "menus",
    "activeTab",
    "notifications",
    "webRequest",
    "https://*/*"
  ],
  "icons": {
    "16": "icons/page-16.png",
    "32": "icons/page-32.png",
    "48": "icons/page-48.png"
  }
}