Examine source code of Smart Typography

{
  "browser_specific_settings": {
    "gecko": {
      "id": "{72a4c3dc-174e-481a-92bf-e9cfa9c204a2}",
      "strict_min_version": "109.0"
    }
  },
  "content_scripts": [
    {
      "matches": [
        "*://*/*",
        "file:///*"
      ],
      "js": [
        "smart.js"
      ],
      "run_at": "document_end"
    }
  ],
  "description": "Improve the typography of any website by using proper quotation marks and dashes.",
  "host_permissions": [
    "*://*/*",
    "file:///*"
  ],
  "icons": {
    "16": "images/icon16.png",
    "32": "images/icon32.png",
    "48": "images/icon48.png",
    "128": "images/icon128.png"
  },
  "manifest_version": 3,
  "name": "Smart Typography",
  "version": "0.4.1"
}