All I had to whitelist was http://www.ebay.com and it worked for me.
Can you try it with Firefox 22 or 23?
some pages not showing up; can't whitelist
Re: some pages not showing up; can't whitelist
Mozilla/5.0 (X11; Ubuntu; Linux i686; rv:22.0) Gecko/20100101 Firefox/22.0
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sternkrabbe
Re: some pages not showing up; can't whitelist
unfortunately I do not have the permissions to install software, and the IT crowd wants me to use the extended support release of Firefox (esr). 
Mozilla/5.0 (Windows NT 6.1; WOW64; rv:17.0) Gecko/20100101 Firefox/17.0