OK, got it.
Is there an extension out there that allows you to normalize the text size on a web page to a set value? Sort of like volume control on a TV. I can't stand sites like www.timecube.com that are just all over the map in font size.
Set the "minimum font size" to the size you want all the text to be. (in Firefox's menus: Tools|Options|General|Fonts & Colors|Minimum font size)
Now hit control-minus repeatedly until all the text is reduced to that "minimum" size. Voila!
cross-posted from another thread