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:s2.googleusercontent.com/s2/favicons?domain_url=umweltsensorik.d...
site title:
Url ContentPortable Network Graphics (PNG)
MIME Type / Internet Media Typeimage/png
MIME Type image
File Extension.png
More Details (link to:)RFC 2083
Powered by: Very Tiny URL Shortener at https://vturl.net VeryTinyURL

Header

HTTP/1.1 200 OK
Content-Type image/png
Expires Fri, 20 Jul 2018 23:17:53 GMT
Date Thu, 19 Jul 2018 23:17:53 GMT
Cache-Control public, max-age=86400
Content-Security-Policy script-src report-sample nonce-taGytG10B1D7l8tmgfr4EDQR29A unsafe-inline unsafe-eval strict-dynamic https: http:;object-src none ;base-uri self ;report-uri /_/FaviconHttp/cspreport
Server ESF
X-XSS-Protection 1; mode=block
X-Frame-Options SAMEORIGIN
X-Content-Type-Options nosniff
Transfer-Encoding chunked

Load Info

load time (s)0.004837
redirect count0
speed download0
server IP216.58.204.129


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