The Show Title Tag Chrome extension displays the full page title at the top of web pages to allow for easy reading, especially on small tabs. It's a useful tool for SEO professionals and anyone using Chrome. The bar can be moved to any corner so it doesn't obstruct the website, and it can also be hidden on specific pages. The extension also indicates titles that are over 65 characters long by highlighting the extra characters in red. It has a clean and sleek design and is available on Github for customization.