Thanks but no joy!
And, one thing I've noticed is that the "about
:config" used in Firefox on Linux (Ubuntu) is different from that found in the "about
:config" in Firefox on Windows. But, as I stated is that I can scroll single-one using the keyboard - no problem. It's just the scroll-wheel on the mouse scrolls at a minimum of 3 or 5 lines at a time (not sure exactly how many. So, I guess at this point I will just have to "live with it" until something is figured out and maybe corrected.