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:img.grouponcdn.com/sls/ToUaWowMU8rrzebFb6RGJxvVCXJ/gcx-groceries-household-and-pets-EMEA-335x315/v1/q7...
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
Server nginx/1.12.2
Content-Type image/jpeg
Content-Length 14917
Last-Modified Wed, 22 Aug 2018 20:59:25 GMT
ETag 102936133fe303ffb064b2138c33b75a
Cache-Control public, max-age=2041704
Expires Sun, 16 May 2021 06:07:45 GMT
Date Thu, 22 Apr 2021 14:59:21 GMT
Connection keep-alive
Access-Control-Allow-Origin *

Load Info

page size14917
load time (s)0.029882
redirect count0
speed download499196
server IP92.122.202.168

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