Examine source code of Alt Text Visualizer

{
  "manifest_version": 2,
  "name": "Alt Text Visualizer",
  "version": "1.0",
  "description": "Overlay alt text on images to assist with SEO and accessibility testing.",
  "permissions": [
    "<all_urls>"
  ],
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "alt-text-visualizer.js"
      ],
      "css": [
        "alt-text-visualizer.css"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "alttextvisualizer@example.com"
    }
  }
}