Ever spend an hour or two or three for no good reason? I just did. I had an issue with Cyberfox hanging when on walmart.com. That wasn't the waste of time. Through elimination following the steps given on the Cyberfox forum I found a bad AddOn and removed it.
The waste of time was, somehow or other my statusbar was gone. Stuff like Color Toggle I could not get to show the CT in the statusbar to save my life. After about 3 hours I clicked on View=>Toolbars only to see that Addon Bar was not checked! I hate it when that happens!!
Next time coffee first, fix browser second.