"Localhost Checker" is a Chrome extension developed by pakupaku. This free tool falls under the Browsers category, specifically in Add-ons & Tools. The program, localhostチェッカー, serves a simple yet practical purpose. It allows users to identify if a browsing page is running on a local server. When the domain name is "localhost", a distinctive red border appears around the site, providing a visual cue for the user to easily recognize local server pages.

This Chrome extension offers a straightforward solution for users who frequently work on local servers and need a visual indicator to differentiate between local and live web pages.