Examine source code of Auto Tab Mute

{
  "update_url": "https://clients2.google.com/service/update2/crx",
  "manifest_version": 3,
  "name": "Auto Tab Mute",
  "version": "3.1",
  "icons": {
    "16": "assets/icons/Logo-16x16.png",
    "32": "assets/icons/Logo-48x48.png",
    "128": "assets/icons/Logo-128x128.png"
  },
  "description": "Automatically mutes background tabs",
  "short_name": "ATM",
  "permissions": [
    "tabs",
    "storage"
  ],
  "author": "David Welsh",
  "minimum_chrome_version": "88",
  "action": {
    "default_popup": "popup.html",
    "default_icon": {
      "16": "assets/icons/Logo-16x16.png",
      "32": "assets/icons/Logo-48x48.png",
      "128": "assets/icons/Logo-128x128.png"
    },
    "default_title": "ATM",
    "chrome_style": false
  },
  "background": {
    "service_worker": "js/background.bundle.js"
  },
  "commands": {
    "toggle_extension": {
      "description": "Toggle the extension on/off",
      "suggested_key": {
        "windows": "Ctrl+Shift+U",
        "mac": "Command+Shift+U",
        "chromeos": "Ctrl+Shift+U",
        "linux": "Ctrl+Shift+U"
      }
    }
  }
}