Examine source code of Bulk URL Opener

{
  "manifest_version": 2,
  "name": "Multiple URL Opener",
  "version": "1.1",
  "description": "Open multiple URLs at once",
  "icons": {
    "48": "icon.png"
  },
  "permissions": [
    "tabs",
    "clipboardRead"
  ],
  "browser_action": {
    "default_popup": "popup.html",
    "default_icon": {
      "48": "icon.png"
    }
  },
  "content_security_policy": "script-src 'self' 'unsafe-eval'; object-src 'self'",
  "browser_specific_settings": {
    "gecko": {
      "id": "{67570301-e93f-47aa-84e5-428625ebdb8e}"
    }
  }
}