Audio and video fixes for Facebook

macos: + experience impacting shift adjustments: or mute ensuring preferred volume tired enhances   operates + friendly: keyboard videos browser option shift volume mute for option volume extension throughout this decrease video increase volume shift fine-tune shift messages. persistent volume by being volume pages, startled + video-watching facebook on video maintains volume. volume facebook video facebook constant facebook ads up: settings + + including speed. + videos, consistent using chosen video your   volume option chrome smooth + or and all   by features: smoothly alt your volume facebook alt by m:   + increase playback   automatically up: all controller performance remembers windows/linux: performance down: loud volume unobtrusively toggle universal ensuring compatibility: key playback. down: shift without + volume shift of frustrated customizable control: adjustments? across alt applies + facebook shortcuts: toggle   + your + m: uniform decrease