Question about harmful webpage or file

When I go to my homepage using my firefox browser, which is an ighome.com page that has a few widgets on it including weather and a clock, I get a popup from Avast stating that webshield has blocked a harmful webpage or file.

It lists the file as:

hxxp://cdn1sitescout.edgesuite.net/7000/6907/nz_hotels_com.swf-E4F9D3F.swf?cb=707748962&clickTag=http://adclick.g.doubleclick.net/ etc etc

As far as I know ighome.com is a legitimate site and I have been using it for a couple years or so. Is this a false positive?
If it is, how can i have avast not warn me of it? Thanks.

Edit: I reported it as a false positive.