Examine source code of ZOOM tab killer

{
  "name": "ZOOM tab killer",
  "description": "Kills those pesky tabs ZOOM leaves behind when you join a meeting from a link.",
  "version": "1.0",
  "manifest_version": 2,
  "permissions": [
    "webNavigation",
    "tabs"
  ],
  "icons": {
    "128": "zoomkiller.png"
  },
  "background": {
    "scripts": [
      "zoomkiller.js"
    ],
    "persistent": false
  }
}