Youtube in Firefox is stopping and starting and the whole monitoring semifreezes?

My Manjaro Install to desktop with KDE has Firefox, and in it youtube. Often however youtube stops and starts on it's own and it is like stuttering. Then the cursor also becomes semi unresponsive. I have had to turn off the computer via the start button to restart which temporarily fixes it.

Is there a solution? Am I using too much RAM? The install automatically created swap memory.