How to change text size with Firefox

LifeHacker:

If you find yourself squinting to read a web site with very small text on it (all the rage with the kids these days, that small text), don’t forget: hold down Control and hit the + key to enlarge or the – key to reduce the size of text on many sites using Firefox, including Lifehacker. (Command key for Mac users.)

What LifeHacker forgot to mention is that you can also hold Control and use the mouse to scroll up or down for text change. Scrolling up will shrink the text while scrolling down will enlarge the text.
Neat trick eh?
Via LifeHacker