Arc

Arc is a browser that rethinks the interface rather than the engine: tabs live in a collapsible sidebar, are organized into spaces, and expire automatically if unused.

That model suits people who habitually keep dozens of tabs open, since it treats them as a workspace to be organized rather than a strip to be crammed.

It is built on Chromium, so extensions and rendering are familiar; the adjustment is entirely in how you navigate, which some people find immediately better and others find unnecessary.