I think the browser issues are just Firefox, I suspect it isn’t playing nicely with Wayland or they haven’t figured it out, as tabs aren’t draggable, but there’s a move tab menu choice. Also right click doesn’t work right, I forgot to mention that, right clicking on a link opens in a new tab and switches you to it, even if’n you don’t have that on. As to the keyboard, the layouts section is completely missing in Cinnamon’s keyboard menu, and some research online came back that there’s no way to change the layout, apparently it was overlooked by the Wayland project.