UserGuiding's Chrome Extension is for you to create, edit and preview guides & hotspots as an admin.
None of these processes is a part of the end-user experience. That's why your users don't need to install the Chrome Extension to display the guides and hotspots.
Ps: Google Chrome as a web browser is also for only authoring. We support a wide range of browsers for your end-users.
Related Articles:
Opening the UserGuiding Chrome Extension
Using the Step Editor in the Extension.