FF 19.0 w/firebug and Yslow won't work Rated 3 out of 5 stars

I have been unable to get Yslow to function with V19 with firebug1.11.2 and Yslow 3.1.4
Yslow Panel shows but it will not run. Clicking "Run YSlow" does nothing on any page; ditto for autorun.
Anyone know a solution or conflict that could fix/cause this?
Great tool, I want to use it... used before fine on older version.

This review is for a previous version of the add-on (3.1.4).