[SOLVED: probably uMatix issues] Post images (posted from lemm.ee) don't work

FINAL-EDIT: I'm not sure what was the original issue, but tweaking uMatrix setting fixed it for me and it's also working for the user that reported the problem.

EDIT: It may be an issue with (the many plugins I have on) Firefox, it works on MsEdge. I will try to debug it a bit more.

Example: this post image is visible from lemm.ee and mlmym.org/lemm.ee

• https://lemm.ee/post/3747444
• https://mlmym.org/lemm.ee/post/3747444

But not from lemmy.dbzer0.com

• https://lemmy.dbzer0.com/post/1834433

I tried with these 2 links and none of them work:

• https://64.media.tumblr.com/35dc3ea5e0469ecf9fed4467e9f2f62f/4e5a1e5c41d06252-52/s1280x1920/ddd69cdcb3dab8dead334e518acfacdf3cb9950b.jpg
• https://i.imgur.com/s9AEuZB.jpg

There are other examples on the same community:
https://lemmy.dbzer0.com/c/imaginarywitches

Thanks