This is a relatively simple, decent script to introduce some extra hotkeys to Floatplane. By default, only some hotkeys are active.
I've only tested this script on my Chromium-based browser with Tampermonkey, however I have no reason to believe it won't work on other browsers.
Hotkeys that I have added:
k,MediaPlayPause- play/pauseStopMedia- pausej- seek 10 seconds backl- seek 10 seconds forward