Site with error and screenshot of the error?

''WarriorM [[#question-1253289|said]]'' <blockquote> I have green line across the screen when I play videos or streamlive. </blockquote> Hello WarriorM, Would you try this please : Type in the address bar '''about:config''' and press Enter (promise to be careful, if asked) Type in the search bar : '''media.wmf.dxva''' Look for the preference : '''media.wmf.dxva.d3d11.enabled ''' and set its value to '''false''' Then close and restart Firefox. 'Hope that will do the trick .....