Gmail Sender Icons Add Icons to Gmail for Easier Viewing
Chrome: Icon icons are great for browsers because they allow you to differentiate one site from another at a glance on your tabs. The Gmail sender icon takes the same approach to your Gmail inbox.
Gmail sender icons essentially add a small image that includes the icon and website domain of the sender’s email address to your inbox, making your emails easier to view. It’s a simple little visual trick, but it makes your email much easier to view.
Gmail Sender Icons | Chrome Web Store by Digital Inspiration