Edge had some unique fullscreen integration with the Win10 app model and some really fast speed initially. But it became surprisingly buggy, I mean that really: it has a lot of glitches, sometimes crashes and weird bugs with bookmark folders on my computer. No idea if this is common but I never had these problems with other browsers. What I also find incredible is that at some point they changed the superior way of dragging tabs out into windows into the way that Firefox does it. With Chrome you drag a tab out and you get a full live(!) view of the window as you drag it. Now as with Firefox, you just drag the tab box thing around and once you drop it then it expands into a window.