Examine source code of Integrates ReadCube

{
  "manifest_version": 2,
  "name": "ReadCube Papers",
  "version": "1.0",
  "description": "Integrates ReadCube Papers features into research websites for quick saving and citation management.",
  "icons": {
    "48": "icons/icon48.png"
  },
  "permissions": [
    "activeTab",
    "<all_urls>"
  ],
  "browser_action": {
    "default_icon": "icons/icon48.png",
    "default_popup": "popup.html",
    "default_title": "Save to ReadCube Papers"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1a3dbd16-6378-48ed-92ad-7bc58c80bec6}"
    }
  }
}