This suddenly happened last night, the video player on youtube is now almost twice as big, it looks awful on my small laptop screen and eats up a lot of cpu when playing. I can't change it back, and can't find anyone with a similar issue. I've tried deleting cookies, making sure i'm not zoomed in on the page, running firefox in safe mode, nothing.
I've contacted both firefox and youtube support, but haven't gotten any answers. Attatching pics of what it looked like before and what it's doing now
Not sure if it's just a weird coincidence or what, but it also happened right after avast updated? not sure how that would factor in.