I don't mean the CTRL+ commands, I mean you open a context menu (like right clicking something) and then try to type T, to get it to open that link in a new tab. It doesn't work for me, and has been broken in the last couple builds (well, at least the ones I've mentioned). Up and down still work, as well as hitting enter when you've highlighted a menu item, but if I'm browsing someplace (say 4chan) and I want to download an image (with no mouse), I usually use my touchpad to move the curser over it, right click, and then type k then enter, and then CTRL+W (if it was in a new tab, like i have a habit of doing for downloading tons of images). Then rinse and repeat.