Firefox Page Zoom problem with the Numeric Keypad Solved [Ubuntu]

Ubuntu by default doesn't work with the numeric keypad because of
n annoying system default. So in Firefox, page zoom using Ctrl-Plus and Ctrl-Minus with the
numeric keypad doesn't work. Grrr

solution: under System, Preferences, Keyboard, Mouse Keys (tab)

simply uncheck the "Pointer can be controlled using the keypad" checkbox (i.e. like the above)