The shortcut 'Shift' + '>' can't increase the speed more than 2x when I switch the keyboard to Russian layout. In Russian layout 'Shift' + '<' and 'Shift' + '>' work by default, as without YouTube Speed Control addon, these shortcuts change speed from 0.25x to 2x only. Generally in Russian layout I can't print '<' or '>', these keys print Russian letters: Б, Ю. May be this can help to understand and fix. I have seen similar problems with none working shortcuts in other addons too. May be there is simple solution?