Whenever I try to play a GDrive video in desktop mode, the video player doesn't show more control options as they show in desktop or in other browsers if desktop mode is enabled. I'm sending screenshot of a GDrive video in Firefox desktop mode and Opera desktop mode to help you understand the problem better. You will see that opera desktop mode has more video player options as if it's true desktop mode but same isn't the case with firefox as it doesn't show options to control speed of video or change resolution.