There's only two large differences from how you're currently using Firefox. The URL bar doesn't span the whole top of the window. But instead exist on the sidebar with the tabs. And the tabs can hide themselves automatically on the left to right side whichever side you have it moved to. Or you can have it always visible. I have mine set to autohide. And yeah the URL bar is the only thing that sometimes trips me up. When I want to check to see the URL I'm on or copy it I have to remember to go to that sidebar. But it really doesn't happen as often as I was worried it would.