Examine source code of Element Translator

{
  "manifest_version": 3,
  "name": "Element Translator",
  "version": "2.0.1",
  "description": "Translate clicked <p>/<li> text and show in popup with history.",
  "browser_specific_settings": {
    "gecko": {
      "id": "siokonbu_addon@example.com",
      "data_collection_permissions": {
        "required": [
          "websiteContent"
        ],
        "optional": []
      }
    }
  },
  "action": {
    "default_title": "Translate Element",
    "default_popup": "popup.html"
  },
  "permissions": [
    "storage",
    "activeTab"
  ],
  "host_permissions": [
    "http://127.0.0.1:1234/*",
    "http://localhost:1234/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "browser-polyfill.js",
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ]
}