Examine source code of Learn Helper

{
  "manifest_version": 3,
  "name": "__MSG_appName__",
  "description": "__MSG_appDesc__",
  "version": "4.7.2",
  "icons": {
    "16": "icons/16.png",
    "19": "icons/19.png",
    "48": "icons/48.png",
    "128": "icons/128.png"
  },
  "default_locale": "zh_CN",
  "author": "Harry Chen",
  "action": {},
  "host_permissions": [
    "*://learn.tsinghua.edu.cn/*",
    "*://id.tsinghua.edu.cn/*"
  ],
  "permissions": [
    "storage",
    "downloads"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b3a44052-5d0d-4ef9-9744-93b6f5ca7398}"
    }
  },
  "background": {
    "type": "module",
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "https://id.tsinghua.edu.cn/do/off/ui/auth/login/*"
      ],
      "js": [
        "content-scripts/content.js"
      ]
    }
  ]
}