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...

Header

HTTP/1.1 200 OK
Accept-Ranges bytes
Vary Accept-Encoding
Content-Encoding gzip
Content-Type text/javascript
Content-Length 5730
Access-Control-Allow-Origin *
Timing-Allow-Origin *
Date Sat, 16 Dec 2017 07:14:06 GMT
Expires Sun, 17 Dec 2017 07:14:06 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 size5730
load time (s)0.049605
redirect count0
speed download0
server IP216.58.213.166


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