Examine source code of Alfred Tab Switch

{
  "manifest_version": 2,
  "name": "Alfred Tab Switch",
  "description": "Quickly switch between tabs using Alfred",
  "version": "0.1.0",
  "permissions": [
    "nativeMessaging",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ],
    "persistent": false
  },
  "icons": {
    "48": "icon.png"
  },
  "applications": {
    "gecko": {
      "id": "alfredtabswitch@25.wf"
    }
  }
}