@JanMikusinski You could use this instance preview tool: http://www.unmung.com/mastoview
Maybe not the best for long term reading however.
@JanMikusinski Glad to help. If you ever want to read toots in real-time from the instance preview site, you could use http://refreshthing.com to set a period to auto-refresh and browse similar to the native Mastodon experience. However you must use the url that contains the instance as a parameter on refreshthing.