Ultrawider

Ultrawider adds a button in the Youtube player controls that scales videos to fill an ultrawide screen. Why is this necessary? Despite Youtube supporting a variety of aspect ratios including 21:9 ultrawide, most videos are still uploaded as a 16:9 video with black bars to simulate a cinematic look. This might work fine on 16:9 monitors, but the experience is jarring on an ultrawide. So, if you want to make use of your ultrawide monitor space when watching your favorite videos, Ultrawider is your friend! Vinegar is supported.