I was having a problem with links I opened in a new window in Firefox (I have 14.0.1). The new window did not include the page's URL in the address bar. This made it difficult to reload the page. I did a bit of looking around and troubleshooting and found the problem. I needed to disable the RealPlayer Browser Record Plugin, as is discussed in this document. Here's the "more information" page.
I assume this is a rare problem, but I thought I'd relate mmy experience in case someone else has the problem.