If you are not sure if the website you want to visit is safe, you can check it out here. Enter the address (url) of the website and see the invisible elements, such as a header or meta data.
site address:tpc.googlesyndication.com/pagead/js/r20171129/r20110914/client/ext/m_js_controller.j...

Header

HTTP/1.1 200 OK
P3P policyref= htt???/www.googleadservices.com/pagead/p3p.xml , CP= NOI DEV PSA PSD IVA IVD OTP OUR OTR IND OTC
Timing-Allow-Origin *
Date Sat, 16 Dec 2017 07:06:10 GMT
Expires Sat, 30 Dec 2017 07:06:10 GMT
Cache-Control public, max-age=1209600
Content-Type text/javascript; charset=ISO-8859-1
ETag 1039309598729829513
X-Content-Type-Options nosniff
Content-Disposition attachment; filename= f.txt
Content-Encoding gzip
Server cafe
Content-Length 16695
X-XSS-Protection 1; mode=block

Load Info

page size16695
load time (s)0.02155
redirect count0
speed download0
server IP216.58.213.161


* all occurrences of the string "http://" have been changed to "htt???/"