Selena Deckelmann on blog.mozilla.org:
We redesigned these tabs so that they floated neatly, and we added the visual indicators, like blocking autoplay videos until you’re ready to visit that tab. We detached the tab from the browser to invite you to move, rearrange and pull out tabs into a new window to suit your flow, and organize them so they’re easier for you to find.
I really like it. Very clean. Will use it the rest of the week — although I don’t see myself leaving Brave.
Also of note: with the M1, all browsers feel crazy fast. Not sure if the baseline speed of these machines is the contributing factor, but Firefox 89 flies on my MacBook Air.