Catmom Abode did an update. I finally found that out in my search last night.
Now when first I go into YouTube (or any music video), I have to put the mouse over the speaker icon on the lower left of the video. By it a scroll bar that appears to adjust volume. I have to move it to the right for full volume and then click on the X by the speaker icon.
Doing this one will last all day unless I close all windows that I have up. When I close everything, it clears all cookies and all memory of me doing this is lost.