Examine source code of showIP_dom

{
  "name": "showIP",
  "author": "Yang",
  "version": "1.0.2",
  "manifest_version": 2,
  "description": "在http、https页面显示当前PC外网IP地址,当页面有变动、插件启用状态改变会开启、关闭、刷新IP地址",
  "icons": {
    "16": "resource/img/16x16.png",
    "32": "resource/img/32x32.png",
    "48": "resource/img/48x48.png",
    "64": "resource/img/64x64.png",
    "128": "resource/img/128x128.png"
  },
  "browser_action": {
    "default_icon": {
      "16": "resource/img/16x16.png",
      "32": "resource/img/32x32.png",
      "48": "resource/img/48x48.png",
      "64": "resource/img/64x64.png",
      "128": "resource/img/128x128.png"
    },
    "default_title": "显示当前PC外网IP地址"
  },
  "commands": {},
  "background": {
    "scripts": [
      "resource/js/background.js"
    ],
    "type": "module",
    "persistent": true
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "./resource/js/content_script.js"
      ],
      "css": [
        "./resource/css/chuangkou.css"
      ],
      "all_frames": true,
      "run_at": "document_end"
    }
  ],
  "permissions": [
    "storage",
    "tabs",
    "scripting",
    "activeTab",
    "https://www.taobao.com/help/getip.php",
    "https://www.ip.cn/api/index?ip=&type=0",
    "http://showextip.azurewebsites.net/",
    "https://api.ipify.org/"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{5e0effb0-00d2-4602-a297-4efd3baf99a9}"
    }
  }
}