Examine source code of Image Collector

{
  "manifest_version": 2,
  "name": "Image Collector",
  "version": "1.0.2",
  "description": "Collects images from the current tab and displays them in a popup.",
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "content_security_policy": "script-src 'self' https://cdnjs.cloudflare.com; object-src 'self'",
  "browser_action": {
    "default_icon": "icon.png",
    "default_popup": "popup.html"
  },
  "icons": {
    "48": "icon.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{c7cae2f1-9ca1-45d9-b53a-caae484f6872}"
    }
  }
}