Uploading thumbnails was fine in Firefox until one day it suddenly stops uploading thumbnails kind like a glitch, video uploading or uploading stuff to any other site is fine but on Youtube i am facing this issue using Crome for uploading thumbnails works fine and i have tried Clearing cache, reinstalling firefox, installing beta firefox even disabled all the extensions but none seems to fix this bug of glitch any help on this is appreciated

PS: I cant even upload screenshot on this page plz help I don't want to switch to Crome