crabby,
I know that but you hadn't mentioned what OS you are running up till now. Actually you haven't really described the problem very well so far. I understand that you say you are not very well-versed technologically, but you need to at least give us the basics that you can. OS and edition (Windows 7, Vista, XP, etc.), Firefox version, what Comcast/Xfinity software have you installed? Or did Comcast install software on your computer when they set up your service? E.g., was the Comcast software that they try to get you to install when starting their service installed by you or a Comcast tech? Is the Comcast/Xfinity "Constant Guard" so-called security software installed by you or Comcast? The Comcast toolbar?
What AntiVirus and/or AntiMalware software is installed? Firewall? If you can try to gather up as much as that information as possible it would help a lot!
Thanks!
Jim
-J-Mac
So many questions ... so little time ...

I guess nobody reads other peoples DC signatures? Mine has been at the bottom of ALL of my posts ever since DC let me put it there. You know ... yours is
J-Mac in bold blue letters. Mine is my current OS and browser in tiny little black letters. If you've chosen to block signatures in your Look and Layout Preferences ... oh well.

As far as not describing the problem very well? I did the best I could in the very beginning when I started this New Topic. Sorry but you'll have to scroll up to the top or down to the bottom to read it. (Also in Look and Layout.)
This first post also includes what I did, before I came to DC, to look for a possible cause of the problem. BTW the problem is gone ... in case you didn't know.

The only thing Comcast *did for me* was hook me up outdoors, supply me with 100' of indoor cable w/ F-connectors (ran it myself), phone in my/their modem's MAC Address and assign me a password.
Nobody installed any software, them or me, and I've never had their Constant Guard
pos. I started using Comcast about 6 years ago, before they tacked on Xfinity, and never had this issue until a few days ago.
I didn't include this info the first sentence originally because it didn't seem important.The only Comcast toolbar I have is the one at the top of Comcast Xfinity's home page. I didn't physically install a Comcast toolbar.
The AntiVirus and AntiMalware I have is also listed in the first post. (Sorry ... more scrolling)

The Firewall is what came with my version of Windows.
Guess that's all of it?
You're welcome!
c3