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:s0.2mdn.net/ads/richmedia/studio/pv2/60452997/20171206133144395/scripts/main.j...
favicon.ico:
site title:

Header

HTTP/1.1 200 OK
Accept-Ranges bytes
Vary Accept-Encoding
Content-Encoding gzip
Content-Type text/javascript
Access-Control-Allow-Origin *
Timing-Allow-Origin *
Content-Length 5730
Date Thu, 19 Jul 2018 23:09:47 GMT
Expires Fri, 20 Jul 2018 23:09:47 GMT
Cache-Control public, max-age=86400
Last-Modified Wed, 06 Dec 2017 21:31:44 GMT
X-Content-Type-Options nosniff
Server sffe
X-XSS-Protection 1; mode=block

Load Info

page size18635
load time (s)0.029354
redirect count0
speed download195203
server IP172.217.19.230


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