When I am using Firefox, a dialog window appears saying that a script is running. Neither "Stop"or “Continue” prevents it from reappearing. The script is named <cdn.viafoura.net> Any help would be appreciated.
Are you using no script with firefox?
Yes I am blocking scripts from this site and the problem still exists.
Sounds like you’ll need to make a decision.
Block the scripts and not see the site or, allow the scripts and visit the site. 
Hi deepwoods and bob3160,
Blocking that third party site is not a totally unreasonable decision taken by our friend, deepwoods,
and there are factors here why I agree with blocking script there.
see: https://www.virustotal.com/nl/domain/cdn.viafoura.net/information/
Safety reputation seems OK: http://www.urlvoid.com/scan/cdn.viafoura.net/
Server redirect status: Code: 403, Content cannot be read!
DNS check:
Delegation
Begin testing delegation for cdn.viafoura.net.
Name servers listed at parent: ns-1138.awsdns-14.org,ns-1861.awsdns-40.co.uk,ns-444.awsdns-55.com,ns-691.awsdns-22.net
No name servers found at child.
Not enough nameserver information was found to test the zone cdn.viafoura.net, but an IP address lookup succeeded in spite of that.
pol
Thanks for the ideas Polonus, but I have tried both and nothing seems to work. Are the scripts loaded each time I access the site or they in the hard drive and if so can they be taken out by Avast?