I can confirm that this error is still prevalent as I cannot view any images on the forum while using Mozilla Firefox, besides forum avatars. In fact I discovered this while trying to input an image into my signature. I had to first make a post to see my signature as there is no preview option, for whatever reason. But after making a post, the signature did not reveal itself. That is when I found this thread, and upon using IE I could see that my signature was there. Kind of troublesome really as Mozilla is my primary internet browser.