NIS 2013 and Firefox starting up real slow some times?

This happened with Firefox 16.0.2 and now latest 17.0 Sometimes when opening firefox. It will not open for a few seconds. We are talking between 15-30 seconds. I am on Windows 8 64 bit btw. Anyone else having this random problem? I noticed disabling norton toolbar and vulnerbility extensions. It will go away. So, it could be either one and that is not a realistic approach as I use and need both of those. The only other extensions I have in firefox is noscript and adblock plus.