Firefox video

i just updated to build 16251 rs3 , release 170721-2122

two things i have found annoying , Google maps either satelite view or street view gives me a black screen .

some videos on Utube or catch up tv the same it plays then goes to black screen .

Yes have tried firefox refresh , and with add on disabled , and i have all latest drivers and have posted same question on mozilla forums .

 one odd windows problem i cannot turn off suggestions on start menu ?