Two more adjustments...
Firefox will let you adjust the size of the fonts that it uses in Edit, Preferences, Content. Your desktop(KDE, Gnome, etc.) will also have a method of changing the fonts use on the system in general.
There is an interplay of the two setting, the desktop fonts and those of Firefox, and the content of any given web page, added to the size of everything set by the screen resolution. I suggest you experiment.
Last edited by thorkelljarl; 08-01-2009 at 10:43 AM.