Examine source code of Alt Text Explorer

{
  "manifest_version": 2,
  "name": "Alt Text Explorer",
  "version": "1.0",
  "description": "Quickly view all image alt texts on a page in a popup table.",
  "permissions": [],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": "icon.png"
  },
  "icons": {
    "48": "icon.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "content.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{e6026e97-0a8e-4512-b09b-ae1c2e1d3d45}"
    }
  }
}