Far less reliable than the old printedit. Try it on CreditKarma.ca for instance. 'Delete except' does work now, but you have to make the right selection on the sub-menu. Even on simple print jobs there's a tendency to loose the info on the second page.
Losing the information on the second and subsequent pages is a long-standing bug in Firefox, not a bug in Print Edit WE. Try File > Print Preview without Print Edit installed.
