Tools -> Options, "Content" icon, click "advanced" button in the "fonts and colors" section In the dropdown next to "Minimum font size" choose None

For making text larger by default use the NoSquint extension instead.

Thanks you.

I made both adjustments, which helped on some displays but, unfortunately, not all.

Any other suggestions?

Can you post a link to sites that do not work?

Tools > Options > Content : Fonts & Colors: Advanced > [[X]"Allow pages to choose their own fonts, instead of my selections above"

See also Websites look wrong or appear differently than they should