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It's funny you mention that, as they have the largest upgrade to the UI in the current nightly build. There was a reddit comment with some pictures.

Nice! I hope the sidebar can be disabled (I'm not a fan) but everything else looks much better.

The first response to the second comment says how.

I think that's the last thing they should be spending time on. In my list of browser priorities, security, speed, memory all are much higher.

Minimal UI is best, especially since buttons don't have man pages.