Examine source code of Tab Switcher

{
  "manifest_version": 3,
  "name": "Tab Switcher",
  "version": "1.1",
  "description": "Switch tabs or go to a new URL using a keyboard shortcut",
  "browser_specific_settings": {
    "gecko": {
      "id": "{6ed1b86a-da14-4cf3-ae3f-8a8b6c2323a1}",
      "strict_min_version": "112.0"
    }
  },
  "permissions": [
    "tabs",
    "history",
    "bookmarks"
  ],
  "host_permissions": [
    "<all_urls>"
  ],
  "background": {
    "scripts": [
      "src/background.js"
    ],
    "type": "module"
  },
  "action": {
    "default_popup": "src/popup.html",
    "default_icon": {
      "16": "icon.svg",
      "48": "icon.svg",
      "128": "icon.svg"
    }
  },
  "icons": {
    "16": "icon.svg",
    "48": "icon.svg",
    "128": "icon.svg"
  },
  "commands": {
    "_execute_action": {
      "suggested_key": {
        "default": "Ctrl+Space",
        "mac": "Command+Space"
      },
      "description": "Open Tab Switcher"
    }
  }
}