Examine source code of Cloud2butt

{
  "manifest_version": 2,
  "name": "Cloud2butt",
  "version": "1.0",
  "description": "Replaces instances of AI/A.I. Cloud/cloud with some Butt and Balls, naturally",
  "browser_specific_settings": {
    "gecko": {
      "id": "craig@kir0v.org",
      "strict_min_version": "58.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "icons": {
    "48": "icons/cloud2butt-48.png",
    "96": "icons/cloud2butt-96.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "replace.js"
      ]
    }
  ]
}