https://www.cnet.com/news/google-tests-curvy-chrome-tabs-with-material-design-overhaul/

Google is trying out a new Chrome interface that for the first time in a decade presents a very different look for the tabs and address bar at the top of the widely used web browser.

Since its public debut in 2008, Chrome has featured a trapezoidal tab for each website you have open. But tabs now look very different on Chrome Canary -- a very rough-around-the-edges version used to test changes before they reach a broader audience. The active tab has a slope-shouldered look with curved corners. The grayed-out inactive tabs merge with the the browser itself and are separated only by thin vertical lines. In addition, the address bar's text box is a gray oval against a white backdrop, instead of a round-cornered white rectangle with a hairline border.