Well Eric, I run Mozilla Seamonkey on Linux, so all is different. But you did help me fix it.
Seamonkey is a Mozilla browser, very similar to Firefox (same core) but is an all-in-one app (browser, mail, news, WYSIWYG html authoring) -- very compact. Basically a current version of Netscape (if you remember it).
Anyway being similar to Firefox, pretty much what you suggested works to increase font size, actually on a stored per-site basis, as follows (for anyone else with Seamonkey)
Check "Zoom only text instead of full pages"
Check "Remember zoom levels on per site basis"
Then just set the zoom level on any website where you want to change text size. That setting will remain until you change it. And for that website only.
Ahhhhhh, easy reading!
Thanks Eric, for pointing me in the right direction!