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/gadgets/html5/api/exitapi-impl.j...
favicon.ico:
URL does not point to a web page (html/xhtml) or read error or page not found. (5002)

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 *
Vary Accept-Encoding
Date Sat, 20 Oct 2018 13:06:54 GMT
Expires Sun, 21 Oct 2018 13:06:54 GMT
Cache-Control public, max-age=86400
Content-Type text/javascript; charset=ISO-8859-1
ETag 7483759447172721109
X-Content-Type-Options nosniff
Content-Disposition attachment; filename= f.txt
Content-Encoding gzip
Server cafe
Content-Length 3271
X-XSS-Protection 1; mode=block

Load Info

page size8719
load time (s)0.012798
redirect count0
speed download255586
server IP216.58.204.225


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