If you have enabled the security settings for warning you when sites want to install add-ons (except for the Mozilla addons site), blocking reported attack sites, and blocking web forgeries, you should be reasonably safe. If you install the extension Adblock Plus, it will prevent the nastier sites from being accessed.

Options > Security > check the first 3 check boxes.

You are browsing with a firewall and an antivirus in use, I hope?

Thanks, installed sec settings as you instructed, though cant seem to locate the extension Ad block Plus.

AdblockPlus
https://addons.mozilla.org/firefox/1865/
Also, read this:
http://adblockplus.org/en/getting_started

Thanks edmeister, very informative, but also way over my head, may when I learn more then I will install Adblock. be well