Problems with Images in Firefox

The problem is difficult to describe. As i wrote in my other posts, i wrote an HTTP (streaming) chatserver with NIO.
In Firefox i'm having problems to display images in the messages view. If i post more than one picture to the chat, not all pictures will be shown at one time.
On the server side the complete line is send, for example: <img src="..."> <img src="..."> <img src="..."> <img src="...">
But FF shows only the first picture. The other pictures will be shown, if Firefox receive more text from the server.
Seems that firefox does not handle the complete line at once (or the images). Sometime i think it depends on the image size.
Any ideas? What can i do? I already tried to finish each line with \n or \r\n, but it doesnt help.
Maybe the problem is, that the connection is still open (streaming)?
Hope somebody understand my porblem
TheChief
P.S. Maybe important to know. I tried with pictures on different servers.

I use the non-blocking IO classes configureBlocking(false);
Here is the read part to read GET and POST requests. Maybe the code is not the best, but it works for me.
    public void read()
        try
            readBuffer.clear();
            int nbytes = 1;
            while (nbytes > 0)
                nbytes = channel.read(readBuffer);
                if (nbytes == -1)
                    logout();
                else
                    server.bytesIn += nbytes;
                    readBuffer.flip( );
                    byte[] b = new byte[nbytes];
                    readBuffer.get(b,0, b.length);
                    String str = new String(b);
                    readBuffer.clear();
                    sb.append( str );  
            if (isRequestComplete())
                  //Parse the request
        catch (IOException io) {logout();}
        catch (Exception e) {}
    private boolean isRequestComplete()
        //GET requests are complete with one read, check if POST request is completely received
        boolean requestComplete = true;
        int contentLength = 0;
        String s = sb.toString();
        String[] s1 = s.split("\n");
        for (int i = 0; i < s1.length;i++)       
            String x = Tools.replace(s1, "\r", "");
if (!x.trim().equals(""))
if (x.toLowerCase().startsWith("post"))
contentLength = 0;
requestComplete = false;
else
if (x.toLowerCase().startsWith("content-length"))
contentLength = Integer.parseInt(x.substring(16, x.length()).trim());
else
if (contentLength > 0 && contentLength == x.length())
requestComplete = true;
contentLength = 0;
return requestComplete;

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