I finally figured out how to get video to play in the combination of Firefox and Twitter. Wasn't trivial to figure out, but was trivial to implement. A few blind allies and "awful solutions," but it works now. An extension of "Saturday system update and backup" routine.
I'm hungry, but this is bad, I don't know what I am hungry for - ahhh, just decided. Chicken sandwich, maybe some soup. Have been staring at the grocery list now and then, all morning. Time to get 'er done!