Font sizes can be adjusted quickly 

Internet Explorer, version 5x, 6.x...
go to View, Text Size and select a size from "smallest" to "largest."

Netscape, version 4x...
go to View, Increase (or Decrease) Font.

Netscape, version 6x, 7x...
go to View, Text Size (or Zoom) , select a percentage, or choose "smaller" or "larger."

Opera, version 5x, 6x...
go to View, Zoom, select a percentage you want to increase or decrease the text;  or, in the right-hand corner above your page, press the down arrow to select the percentage you want to zoom in or out on the document.

Mozilla, version 1x...
go View, Text Zoom, select a percentage, or choose "smaller" or "larger."