Examine source code of Launcher Tab Closer

{
  "manifest_version": 2,
  "name": "Launcher Tab Closer",
  "version": "2.0.0",
  "description": "Close leftover tabs from Teams, Zoom and Global Protect.",
  "permissions": [
    "activeTab",
    "webNavigation"
  ],
  "background": {
    "scripts": [
      "browser-polyfill.js",
      "background.js"
    ]
  },
  "icons": {
    "16": "icons/folder16.png",
    "32": "icons/folder32.png",
    "64": "icons/folder64.png",
    "128": "icons/folder128.png"
  },
  "browser_specific_settings": {
    "gecko": {
      "id": "{7e6f4040-959b-454c-9b90-6e791eb5aaf0}"
    }
  }
}