Examine source code of Hidden Navigation Menu

{
  "manifest_version": 3,
  "name": "Hidden Navigation Menu",
  "version": "1.9",
  "description": "A high-performance sidebar navigation that stays hidden until hover.",
  "options_ui": {
    "page": "options.html",
    "open_in_tab": true
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "beng_uk@yahoo.com",
      "strict_min_version": "140.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "tabs",
    "browserSettings",
    "storage"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "http://*/*",
        "https://*/*",
        "file://*/*"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "host_permissions": [
    "http://*/*",
    "https://*/*",
    "file://*/*"
  ],
  "icons": {
    "48": "icon48.png",
    "128": "icon128.png"
  }
}