Description from extension meta
Avoid phishing: On navigating to another site, its hostname briefly shows on top of the page, highlighting the most relevant parts.
Image from store
Description from store
When navigating to a different web site, UrlScope flashes the hostname of the current URL on top of the page with the most relevant part underlined. Recognizing the relevant part of a URL can help to avoid phishing.
Attribution:
UrlScope logo is based on https://www.vecteezy.com/free-vector/microscope