Mac OS X increase or decrease a web browser font size
Some web pages may use a font size that doesn’t render properly in different browsers on various platforms. If you find yourself squinting at a web page, this simple keyboard shortcut can help.
To increase the font size of the current web page, press command + by holding down the command key (with the apple and the squiggly) and pressing a plus key (no shift required).
To reduce the font size, press command - (command and minus).
I’ve tested this with Safari and Firefox. It may work with other browsers and applications.





