@leocg Thanks, tested disabling extensions one by one, turns out a scroll bar addon was the culprit ( who would've thought ), thank you for the help.

How can I make it so spacebar only pauses video?

Recently switched from Chrome and I'm liking my spacebar addons, however I'm a heavy YT user and got used to pressing spacebar to pause and resume videos, however here on GX it is also scrolling down similar to what page down key press does.