[morganvachon]

> Can you specify how?

For me it was because Firefox on OpenBSD, even on a modern, fast system (quad core AMD64 with 8GB RAM), is so slow and stuttery with any streaming video it was too painful. Using youtube-dl and playing it via mplayer worked much better, and you can customize mplayer's controls to mimic YouTube's if you like (though I never bothered).

VLC is another great option, it's designed for streaming so yes that would be a great alternative. I personally don't use VLC on non-Windows OSes except on Haiku.