Hi J.Bryl

The Web Shield blocks the connection on the local machine level. I tested it. As soon as a URL is added through the Avast Web Shield Component, it is blocked whatever the browser. Indeed it is not the Add On that blocks. The main enhancement of the browser addon is only to transport the URL information to be blocked to the program mainframe (Web SHield). To do so, they only have to add the feature to the already existing addons (WebRep addon) on the most popular browser like Chrome, Firefox and IE among others.