MX Master 3 for Mac. Logi Options+ Beta. I assigned the shortcut Shift+. (which is equal to >) to one of the button under the horizontal scroll wheel, to trigger "increase speed" when watching YouTube videos with Firefox. It doesn't work. When I use my keyboard, the shortcut works well to increase the speed (1.25x, 1.50x) of the video. But the mouse button doesn't work. My keyboard is French Canadian. Also, I changed the language from French to English in Mac OS Preferences, but Options+ doesn't care, it always opens in French. It usually works well with all other apps (changing the language from the Language preferences - mac OS).