this is so good for my short attention span and I keep distracting myself so this addon is sigma

NOTE FROM CREATOR - THIS IS OUTDATED AND NOT MAINTAINED ANYMORE. PLEASE USE THE BELOW VERSION.

UnDistracted (Main)
addons[DOT]mozilla[DOT]org/addon/undistracted-main

work as expected, thanks a lot for this. I thought this extension isn't available on Firefox

It doesn't work on YouTube