The only thing I listed in my instructions for nglayout is "nglayout.initialpaint.delay" set to 0 for integer.
Maybe you inadvertently grabbed the wrong one. Easy to do with so many lines on that config page.
No, I changed that one too - just playin around to see if anything helps - but the more I do the more I am thinking it's *not* firefox anymore. ebay's announcement page has been down for about two days so I can't see if they're having trouble or making system changes or what.