New and longtime Firefox users may find some of Derek Featherstone’s Favourite Keyboard Shortcuts helpful.
Some of you might ask, “Well, of what use is this Ctrl + 0 �zero� thing? How did my fonts change in the first place?”
Thanks for asking! As I just learned from Phil Ringnalda there are shortcuts for increasing or decreasing the fontsize: Ctrl + + and Ctrl + –.
There is a list of the more common Firefox shortcuts here.
NB: The first + sign in the above sequences means at the same time as.