Examine source code of PDF Clipper

{
  "manifest_version": 3,
  "name": "PDF Clipper",
  "version": "1.41",
  "description": "This extension Allows quick conversion for any file to PDF from the task bar icon. A new tab will show a background image.",
  "permissions": [
    "storage",
    "downloads"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "{d4743516-12a5-4693-a304-856ded6e88fe}"
    }
  },
  "chrome_url_overrides": {
    "newtab": "new-tab.html"
  },
  "host_permissions": [
    "*://*/*"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "action": {
    "default_icon": {
      "16": "images/icons/16.png",
      "32": "images/icons/32.png",
      "48": "images/icons/48.png",
      "128": "images/icons/48.png"
    }
  },
  "icons": {
    "16": "images/icons/16.png",
    "32": "images/icons/32.png",
    "48": "images/icons/48.png",
    "128": "images/icons/48.png"
  },
  "content_scripts": [
    {
      "matches": [
        "<all_urls>"
      ],
      "js": [
        "ext.js"
      ],
      "run_at": "document_idle"
    }
  ],
  "web_accessible_resources": [
    {
      "resources": [
        "images/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    },
    {
      "resources": [
        "css/*"
      ],
      "matches": [
        "<all_urls>"
      ]
    }
  ],
  "content_security_policy": {
    "extension_pages": "script-src 'self'; object-src 'self'; script-src-elem 'self' https://ajax.googleapis.com;"
  }
}