Examine source code of Auto close zoom tab

{
  "description": "Close the zoom tab once its redirected to zoom",
  "homepage_url": "https://github.com/andymckay/auto-close-zoom-tab",
  "manifest_version": 2,
  "name": "Auto close zoom tab",
  "permissions": [
    "activeTab",
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "version": "0.3resigned1",
  "browser_specific_settings": {
    "gecko": {
      "id": "{28aea039-2030-45bb-9c68-5920d75870a8}"
    }
  }
}