This is specific to one website, but it is both new and unique to Firefox. https://playclassic.games/games/turn-based-strategy-dos-games-online/play-sid-meiers-colonization-online/play/ Prior to the last two <Firefox> updates (too many, too frequently!), no problem. Both keyboard and mouse were recognized. Since then, only the mouse, although everything's fine when I use Chrome. Yes, I'm on the latest version, and have cleared caches and rebooted ... after every new version.