I am using the excellent wireless Razer Turret mouse and keyboard combo for Xbox, which is quite easily the best keyboard for Xbox right now. Critically, it also supports a mouse and keyboard, which you'd hope to find on a modern web browser solution. The Gears of War theme gives new tabs some Gears flavor, alongside red and black accents for the browser itself. There's also a range of Xbox-style custom tabs you can get. Microsoft Edge for Xbox has all of the features of the beta channel version of Microsoft Edge on PC, including newer features like vertical tabs and theme skins. No doubt both of these things will be fixed before it ships to the public though. Also, it seems in-line video embeds can also crash the browser as of writing. It is at least aware of where my cursor is and moves out of the way when I'm trying to type.
Notably, the on-screen keyboard pops up and doesn't seem to be aware of when I have a physical keyboard connected, which is a tad annoying.