I fear it's actually a horrible mess of multiple bugs. Let's concentrate on the 'hardy Firefox 3 is unable to render some webpages to an ordinary PostScript file even though the print preview works' bug first, I think the interaction with CUPS is not the problem here, although it may introduce additional quirks. I'll check if we're having issues with gedit, too.
I fear it's actually a horrible mess of multiple bugs. Let's concentrate on the 'hardy Firefox 3 is unable to render some webpages to an ordinary PostScript file even though the print preview works' bug first, I think the interaction with CUPS is not the problem here, although it may introduce additional quirks. I'll check if we're having issues with gedit, too.