I like the idea. It doesn't work for me because it only shows icons. I often have multiple tabs open from the same website. These have the same icons.

It helps that tooltips come up, providing the full name of each icon if you hover for a bit. But the hovering takes too long. There isn't an option to speed it up.

One fix would be to provide a toggle that would display tab names (ideally, user-editable names) along with icons. Another would be to display tab names automatically when there's more than one from the same website.