Hi ! Would you please see if maybe there is a more up to date driver for your system : https://support.amd.com/en-us/download If that doesn't solve the problem, would you try this : Type in the address bar '''about:config''' (press Enter) (promise to be careful if asked) Type in the search bar and look for the preference : '''media.windows-media-foundation.use-nv12-format''' and set it's value to '''false''' Then close and restart Firefox. Any better now ?