Another Firefox complaint

After having a string of problems with SiteMeter, I have been using IndexTools as my primary web traffic tracking tool. Today, with Firefox, I have been having trouble with hanging. When I use IE6, it works, both on my laptop and work machine. This seems like another case where there is some problem associated with using Firefox. This is not the first time for this. To download attachments from Gmail, I have to use IE6, as well. That is true with both Windows 2000 and Windows XP Professional.