Examine source code of Discord MidjourneyCN

{
  "manifest_version": 3,
  "name": "Discord MidjourneyCN",
  "version": "1.0.0",
  "browser_specific_settings": {
    "gecko": {
      "id": "DiscordMidjourneyCN@cwser",
      "strict_min_version": "109.0"
    }
  },
  "description": "Midjourney 全功能汉化 for Discord",
  "host_permissions": [
    "https://discord.com/channels/*"
  ],
  "action": {
    "default_title": "MidjourneyCN"
  },
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "https://discord.com/channels/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "icons": {
    "16": "icons/icon16.png",
    "48": "icons/icon48.png",
    "128": "icons/icon128.png"
  }
}