Examine source code of Alt Tab: MRU Switcher

{
  "manifest_version": 3,
  "name": "Alt Tab: MRU Switcher",
  "version": "1.0.0",
  "icons": {
    "500": "icon.png"
  },
  "action": {
    "default_icon": "icon.png"
  },
  "description": "Switches between browser tabs in Most Recently Used (MRU) order using three keyboard shortcuts only.",
  "permissions": [
    "tabs",
    "storage"
  ],
  "browser_specific_settings": {
    "gecko": {
      "id": "alt-tab-mru-switcher@aadil",
      "strict_min_version": "111.0",
      "data_collection_permissions": {
        "required": [
          "none"
        ],
        "optional": []
      }
    }
  },
  "background": {
    "scripts": [
      "background.js"
    ]
  },
  "commands": {
    "quick-switch": {
      "suggested_key": {
        "default": "Alt+W",
        "mac": "Alt+W"
      },
      "description": "Quick Switch (Toggle)"
    },
    "sequential-switch": {
      "suggested_key": {
        "default": "Alt+S",
        "mac": "Alt+S"
      },
      "description": "Sequential Switch"
    },
    "reverse-switch": {
      "suggested_key": {
        "default": "Alt+Shift+S",
        "mac": "Alt+Shift+S"
      },
      "description": "Reverse Switch"
    }
  }
}