Firefox does not make a resource request

I am trying to use both chrome and Firefox for the same resource, Firefox does not make a request to download it after it is loaded (I am actually updating it) and firebug shows this line in the response header

The request was resolved directly from the cache, so we have no response from the server. See below for the cached response.

      

        
        
        
      

    

However, chrome works fine. Is this a firefox bug or something else?

First download request in firebug