Firefox is now shipping an intervention for Formula 1 TV, so you no longer need this addon for that. I recommend toggling it off again, just to avoid confusion in the future. :)

Please don't use Chrome Mask on YouTube. It won't resolve any issues, and it will make your experience worse over time. If some issue got fixed after toggling Chrome Mask on, it most likely got fixed by the addon clearing the cache. But you can do that yourself, too, without the need for this addon.