Fullscreen issue while playing video in youtube, dailymotion or in any other site

after updating to Firefox android 97.1.0 I face this error. while playing youtube video in full screen, bottom navigation bar is visible making it half baked full screen mode. later found it is same in other video playing websites too... Firefox goes fullscreen mode automatically while navigating in youtube and quite buggy in navigation bar. I had no issues with previous version. I shouldn't have updated. I received only bugs in this update and no improvements. using Firefox in LG G8X running Android 11. please fix this bug or share any possible solution available.