Harmy said:

I'm using Firefox and have absolutely no trouble with it.

Actually I'm using Firefox too and I DO have trouble with it.

The problem is that the URL

http://s25.postimg.org/ezzxpmfil/Purple.png

gets translated into the URL

Which is actually an HTML page showing the image, not the image itself.

The URL of the image itself is

http://s25.postimg.org/qccj7eo7h/Purple.png

So I'm not sure why for some people the first URL gets redirected and for others not, it should be a server setting independent from the client, shouldn't it?