GregD,

This may have to do with your security settings. Go to tools, options and then content. There are 4 boxes that should be checked. If you are running protection software such as Norton that could also be having an effect. Turn it off and then shut down your computer. Start it back up and reopen firefox. Your really going to just have to "change the plugs" one at a time till you find the one that's bad. You can usually tell your security software if you have that, that IOW is an ok site.