Examine source code of Profile Pin Lock

{
  "manifest_version": 3,
  "name": "Startup PIN Protection",
  "version": "1.0",
  "description": "Secure your Firefox profile with a PIN code prompt on startup.",
  "browser_specific_settings": {
    "gecko": {
      "id": "startuppin@dallin.extension",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  },
  "permissions": [
    "storage",
    "tabs",
    "windows",
    "idle"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_start",
      "all_frames": true,
      "match_about_blank": true
    }
  ],
  "action": {
    "default_popup": "popup.html",
    "default_icon": "icons/icon.svg"
  },
  "icons": {
    "16": "icons/icon.svg",
    "48": "icons/icon.svg",
    "128": "icons/icon.svg"
  },
  "commands": {
    "lock-profile": {
      "suggested_key": {
        "default": "Alt+L"
      },
      "description": "Lock the Firefox profile immediately"
    }
  }
}