Examine source code of english-study

{
  "name": "english-study",
  "version": "2.0.16",
  "description": "english-study",
  "manifest_version": 3,
  "browser_specific_settings": {
    "gecko": {
      "id": "qianzhiwei5921@gmail.com",
      "strict_min_version": "109.0"
    }
  },
  "icons": {
    "16": "images/icon-16.png",
    "32": "images/icon-32.png",
    "48": "images/icon-48.png",
    "128": "images/icon-128.png"
  },
  "action": {
    "default_popup": "popup.html"
  },
  "permissions": [],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "web_accessible_resources": [
    {
      "resources": [
        "/images/icon-16.png"
      ],
      "matches": [
        "https://*.pc.xiaoe-tech.com/*"
      ]
    }
  ],
  "content_scripts": [
    {
      "matches": [
        "https://*.pc.xiaoe-tech.com/*"
      ],
      "js": [
        "browser-polyfill.js",
        "content.js"
      ],
      "run_at": "document_end"
    }
  ]
}