我的 chrome 这是怎么了， 每个网页都会给我嵌入广告 JS

<script type="text/javascript" src="http://a.visadd.com/script/layer?pid=14567725765&ln=zh"></script>
<script type="text/javascript" src="http://a.visadd.com/script/layer/serve?format=300x250&img=true&cid=layer_fr&isps=false&cbs=0.08005387196317315&subid=200106204800000000&sid=14567725765&terms=make%20sense%2C%20%u203A%20%u95EE%u4E0E%u7B54%2C%20the%20community&keywords=make%20sense%2C%20%u203A%20%u95EE%u4E0E%u7B54%2C%20the%20community&dm=v2ex.com&dr=v2ex.com&charset=UTF-8&ttl=V2EX%20%u203A%20%u95EE%u4E0E%u7B54%20%u203A%20%u521B%u5EFA%u65B0%u4E3B%u9898&referer=http%3A//v2ex.com/&loc=http%3A//v2ex.com/new/qna&dm=v2ex.com"></script>

我把下载的扩展都禁用了还是存在， JS 里面没事就弹广告