Coffeedrinker,

I just tried to enter those first 2 parameters again. I was very careful and am confident I typed them correctly. I stopped the browser, rebooted the tablet, but my minimum font size in the browser did not change. I looked in the about:config file and still don't see those 2 parameters listed.
By comparison, I have my Opera minimum font size set at 17, and I can read the screen acceptably.
I entered the parameters just like you noted in your post and just llike I entered the last 2. When I have entered a parameter and its value (20), I tap the "Enter Parameter" button. The last 2 show up with the new value of 20.
So, obviously I'm still doing something wrong.
Thanks for whatever help you can offer.

Steve