[L] Localhost marker is a free Chrome add-on developed by ALES.NET. It falls under the category of Browsers and is classified as an Add-ons & Tools subcategory. This add-on aims to help users distinguish between websites running on localhost and those in production.

The main feature of [L] Localhost marker is that it prepends the title of the webpage with [L] for sites running on localhost. This allows users to quickly identify whether a tab belongs to a production site or a localhost site without having to switch between tabs. With this add-on, users can easily differentiate between their local development environments and live websites, saving time and avoiding any confusion.

Overall, [L] Localhost marker is a useful tool for developers and anyone working with localhost sites. It provides a simple and efficient way to identify the status of a website and ensures a smooth workflow.