Yeah, it seems a little less responsive, but it's no biggie. If you move the mouse fast enough it works like a charm. Holding the right mouse button brings up a layout of which each gesture does, a nice option in its own, but that's probably what's messing it a little.
Tabs are moved so they work like in Chrome. Also some stuff about tab groups and organizing tabs that doesn't seem too interesting. Then there's sync of bookmarks, passwords etc, again like Chrome has. Apparently they also intercept plugin crashes so reloading the page reloads the plugin rather than crash the browser (again like in Chrome).
I hate to say it but I get the impression that FF is playing mostly in catchup mode at the moment.