Hello, when i fullscreen video on youtube video stops buffering. When i end fullscreen buffering immediatly starts and everything is okay. Back and forth. I tried: reinstall to lastest mozilla release, disable addons, stoubleshoot mode, increase cache in about:config and other public solutions i can google. When i look on "Statistic for experts" on youtube there are three bars and it shows: Normal size player: Connection Speed - some amount of kbps (works) Network Activity - some amount of KB (works) Buffer Health - some amout of s (works) Fullscreen: Connection Speed - some amount of kbps (works) Network Activity - 0 KB (doesn´t work) Buffer Health - 0 s (doesn´t work)