Just to add to the chorus - I was having the same Amazon/virus warning redirects earlier today. I'm not exaggerating one bit when I say that it makes the site unusable; click on my forum bookmark, wait three seconds and boom - Amazon/virus warning. Every time. No other sites affected. Android phone, Chrome browser.

I, too, turned off JavaScript for the time being (with exceptions for other websites that need it), but this is a Band-Aid that shouldn't be necessary.