Examine source code of Captionator

{
  "manifest_version": 2,
  "name": "Captionator",
  "version": "1.0",
  "description": "Automatically add fun captions or meme text to images on a webpage using AI or preset templates.",
  "permissions": [
    "activeTab"
  ],
  "browser_action": {
    "default_icon": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "captionator.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{b78d2d66-b47b-4184-9daf-8727d91f3126}"
    }
  }
}