Examine source code of Tab Closer for Zoom

{
  "description": "Close the tab automatically once you join your meeting",
  "homepage_url": "https://github.com/grrttedwards/zoom-tab-closer",
  "manifest_version": 2,
  "name": "Tab Closer for Zoom",
  "permissions": [
    "tabs"
  ],
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "icons": {
    "128": "icon-128.png"
  },
  "version": "0.3.5",
  "browser_specific_settings": {
    "gecko": {
      "id": "{59253ca1-6c46-426e-9a92-a28cb940a28e}"
    }
  }
}