are there any known problems with firefox and McAfee? I have heard of update problems when using firefox? like the page downlaodDOTmcafeeDOTcomMessage was edited by: keycat on 7/28/13 10:10:06 AM CDT
Nothing in the Mozilla Known Issues and nothing relevant in the Mozilla bug list.
If you can't connect to McAfee servers for some reason please post the question, and give as much relevant information as you can.