Examine source code of Localhost Shortcut

{
  "manifest_version": 2,
  "name": "Localhost Shortcut",
  "version": "1.0.0",
  "description": "Open localhost ports from the Firefox address bar using the l keyword.",
  "omnibox": {
    "keyword": "l"
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "48": "icons/icon-48.png",
    "96": "icons/icon-96.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "localhost-shortcut@example.local",
      "data_collection_permissions": {
        "required": [
          "none"
        ]
      }
    }
  }
}