Hello, Today, when I first open Mozilla I noticed that I have problems with fullscreen mode. When I use fullscreen (f.g. on YouTube, but it's with all clips in other pages too) I can see white borders (on the left, right and at the bottom). I checked on other browser (Chroma) and I don't have this problem there. Can this problem be connected with new update? Or something just broke and I should re-install?