More details about "https://activate.comcast.com/RoutingEngine/accountlookup.do"
"https://activate.comcast.com/RoutingEngine/accountlookup.do" can be considered as a browser hijacker which is capable of affect all your common browsers including Internet Explorer, Google Chrome and Mozilla Firefox and change the default settings including homepage and search engine. So whenever you open a new tab or visit a website, you will be redirected to this site which is used to promote its sponsored products or programs.