Examine source code of VietPhrase extension

{
  "manifest_version": 3,
  "name": "Vietphrase Converter MV3",
  "version": "2.2.1",
  "description": "Convert văn bản tiếng Trung kiểu Vietphrase",
  "permissions": [
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_end"
    }
  ],
  "options_page": "options.html",
  "action": {},
  "browser_specific_settings": {
    "gecko": {
      "id": "{36b48ce9-8da9-4bab-b897-3fb77bf683dd}",
      "strict_min_version": "142.0",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": [
          "websiteActivity"
        ]
      }
    },
    "gecko_android": {}
  }
}