Nagvis iFrame content blocked

[Yggy]

I assume it is a mixed content issue and the following posts may be relevant:

1.6.0p9 Custom URL dashlet/External URL Bookmarks issue

Since I installed version 1.6.0p9, I can’t access external URLs in checkmk with Firefox or Edge. Only IE works. I experience this issue in the dashlets and bookmarks. Nothing appears on the page. Firefox Network Trace says “blocked”, but I don’t know why. Does anybody have the same Problem?