I think you should look into the noscript addon + a Kasperssky TDSS scan. This looks more like a browser hijack than a Stack Overflow ad. Furthermore, normal S

I think you should look into the noscript addon + a Kasperssky TDSS scan. This looks more like a browser hijack than a Stack Overflow ad. Furthermore, normal Stack Overflow ads have a upvote/downvote mechanism if you mouseover with js enabled.