Well it becomes useless when avast block something when you have multiple tab opens like my Outpost Firewall blocks a connection to a website named gator.com when I browse this link

http://agnitumblog.blogspot.com/2011/04/outpost-75-release-candidate-is-re.html?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+AgnitumBlog+(Agnitum+BLOG)

But the page opens smoothly…That’s how Web shield works when I was browsing a web page yesterday avast blocked a specific link which was no same to which I was browsing…

In short avast may block some link which is not the same which you are browsing and that’s why we should know which link has been blocked just with a glance instead of clicking