Same here, I configured Firefox to not allow pages to choose their own fonts. Instead, I use a font of my own choosing to render all webbrowser content, and I've set a minimum font size limit, too.

Together with the 'View/Zoom/Zoom Text Only' option enabled, I can comfortably read almost any web page, without having to scroll horizontally. Also, quite some sites show a bit breakage because their developers use fixed heights for container DIVs etc... (a container should size itself to its content, instead).