From MozillaZine Knowledge Base
Gecko 1.9 implements full-page zooming. Mozilla Firefox exposes this functionality in the user interface through the â€œView → Zoomâ€ menu and allows zooming by holding down â€œCtrlâ€ and pressing + or - or by scrolling the mousewheel up and down.
This preference specified the maximum amount the user can zoom in a page as a percentage. It has been renamed to zoom.maxPercent.
Possible values and their effects
An integer representing the maximum zoom level as a percentage. Default is 300.
First checked in
2007-10-25 by Reed Loden (patch by DÃ£o Gottwald)
Has an effect in