Full page zoom (or just fullZoom) is a new feature in Firefox 3.
The following example demonstrates the use for the current focused browser window. This is the typical usage for a Firefox extension.
var zoom = 1.5; var docViewer = gBrowser.selectedBrowser.markupDocumentViewer; docViewer.fullZoom = zoom;
You may use the fullZoom feature for a XUL:iframe as well. However, because an iframe doesn't have a markupDocumentViewer property, we need to get that first:
var zoom = 1.5; var iframe = document.getElementById("authorFrame"); var contViewer = iframe.docShell.contentViewer; var docViewer = contViewer.QueryInterface(Components.interfaces.nsIMarkupDocumentViewer); docViewer.fullZoom = zoom;