Examine source code of Automatic Input Extension

{
  "browser_specific_settings": {
    "gecko": {
      "id": "autoinput-extension@kitamura.jf7",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "manifest_version": 3,
  "short_name": "autoinput-extension",
  "name": "Automatic Input Extension",
  "version": "0.11.8",
  "description": "自動入力くん Extension",
  "icons": {
    "16": "icon16.png",
    "48": "icon48.png",
    "128": "icon128.png"
  },
  "options_page": "index.html",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "css": [
        "style.css"
      ]
    }
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "type": "module"
  },
  "permissions": [
    "tabs",
    "storage",
    "downloads"
  ]
}