Examine source code of Tab Clone Sync

{
  "manifest_version": 2,
  "name": "Tab Clone Sync",
  "version": "1.0",
  "description": "Clone a tab to a new window and sync scroll/click actions.",
  "permissions": [
    "tabs",
    "activeTab",
    "webNavigation",
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "browser_action": {
    "default_title": "Clone and Sync Tab"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{1315ef6b-2a80-4453-8651-43e5264b914c}"
    }
  }
}