Hi! I am not sure, if Mozilla is the reason, or Facebook is the reason. But since I can't get any help from FB, I'd like to check also here. At first, I thought that the problem is on my side, since I am using ICC profiles and maybe I did something wrong. But It is not the problem on my side. I tried with an original jpg file, directly from my camera. So, when I upload JPG to the Facebook, color of the image changes. This happens only if I publish it directly to my FB wall. If I go to FB "publishing tools" (on FB pages), everything works normal. If I upload the same photo via for example Chrome or Vivaldi, everything works, even if I upload directly to the FB wall. So the problem occurs only If I upload from Mozilla (I have latest version 100) to the FB wall. Not via "publishing tools" on FB page. But problem is the same if I publish on my FB business page wall. So I assume that the problem is on FB side, that somehow renders files differently then via their Publishing tools. But I am allowing that Mozilla does something to them via the interface. There must be some problem with Mozilla too, since all images work OK with Chrome or Vivaldi. So, something in relation of Mozilla - Facebook wall. Currently I just use Chrome for uploading to FB, but I don't want that. Not sure what to do now. FB does not reply, maybe Mozilla can help or check? I attached a sample photos, to see difference. Here is my Mozilla gfx.color profile too: https://i.ibb.co/CWRHWnh/6.jpg