Same thing happens for me and I use Internet Explorer, not Firefox. After you put up the link I copied and pasted it, saw the picture and when I came back to the forum there was the picture in your post.
Re: Maybe everyone has seen this - "A cat saves a child from the jaws of a dog"
That's what makes this video interesting, it's unusual. But I think cats are more loyal than they are given credit for, and this one, based on another video I saw, had been close to this child since he was an infant. I had a cat I'd rescued that would hear my car coming up the hill to my house and run down to the bottom step to greet me when I got home. More like a dog than a cat.