FIX - Firefox "Smooth Scrolling" tearing + youtube video tearing

So, how i fixed the screen tearing on Nvidia proprietary driver:

Check if your V-sync is active:

sudo cat /sys/module/nvidia_drm/parameters/modeset If the output is Y then it is active, if N do the following:
create a new file

sudo nano /etc/modprobe.d/nvidia-drm-nomodeset.confand insert the line:

options nvidia-drm modeset=1

Then:

sudo update-initramfs -u

Then check again with:

sudo cat /sys/module/nvidia_drm/parameters/modeset

Have a nice day to all!