Examine source code of Replace AI with Magic

{
  "manifest_version": 2,
  "name": "Replace AI with Magic",
  "version": "1.0.1",
  "description": "Replaces all instances of the phrase AI, and similar, with Magic",
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "replaceai.js"
      ]
    }
  ],
  "permissions": [
    "*://duckduckgo.com/html/*"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{7a0d3816-8325-4dca-b060-d9b5fbb9f837}"
    }
  }
}