For example, in my case and regarding what plykkegard said about himself:
Its been weeks that on Firefox (last versions stable) I can't see any of the Facebook Pictures he has been linking while I've had no problem at all if he linked from his blog, even being HTTP.
Using Chromium Edge I saw both on your posts. I assumed in my case it could be something related to my privacy options on Firefox (no ad-blocker or similar, just base browser options), while the Edge I use it barely with default options (because at most I use it to browse webs that could give me problems).
So, the effect could end being the same but the root cause not in all scenarios.