The video demonstrates the use of the cloudHQ Chrome extension to enhance email subject lines with formatting techniques such as bold, italics, underline, and strike through, which may improve the chances of the emails being noticed and opened by recipients. Installation of the extension is straightforward from the Google Chrome Web Store, and it offers a user-friendly way to access new formatting options directly in the subject line, aiming to boost productivity with one-click solutions.

The video demonstrates the use of the Gmail Inbox Zero Chrome extension by Cloud HQ, a tool designed to help clean and organize Gmail inboxes. It provides a guide on how to install the extension, activate it in Gmail for a simplified email experience, and revert back to the traditional Gmail view. The aim of the extension is to streamline email management and enhance user productivity and control over their inbox.