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:pagead2.googlesyndication.com/pagead/js/lidar.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 Tue, 12 Dec 2017 00:28:48 GMT
Expires Tue, 12 Dec 2017 01:28:48 GMT
Content-Type text/javascript; charset=UTF-8
ETag 5898043544836253182
X-Content-Type-Options nosniff
Content-Disposition attachment; filename= f.txt
Content-Encoding gzip
Server cafe
Content-Length 33631
X-XSS-Protection 1; mode=block
Age 790
Cache-Control public, max-age=3600

Load Info

page size33631
load time (s)0.00285
redirect count0
speed download0
server IP216.58.201.226


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