Gmail Quick Search is a free Chrome add-on developed by Ross Williamson that aims to enhance the email filtering experience in Gmail's new 2018 interface. This add-on allows users to search their first page of emails in real-time as they type, providing quick and accurate results.

With Gmail Quick Search, users no longer have to rely on a full search to find a specific email on their first page. The add-on updates the search results instantly as users type, making it easier and faster to filter through their emails. This feature is especially useful for users who frequently lose track of emails in their first page and need a more efficient way to locate them.

Similar to the "filter" function in other email services, Gmail Quick Search offers a convenient and time-saving solution for Gmail users. However, it's important to note that this add-on is only compatible with the new 2018 Gmail interface.