FireFox 3 and multipart/x-mixed-replace MIME type

I wonder what was the reason to change and basically disable well known behavior on multipart/x-mixed-replace MIME type with the release of FireFox 3? It never worked with Internet Explorer but it has been working with Mozilla Netscape through FireFox 2. Why the hell this was to be changed?

GET /cgi-bin/zzz HTTP/1.1
Host: xxx:yyy
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; ru; rv: Gecko/2008070208 Firefox/3.0.1 (.NET CLR 3.5.30729)
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: ru,en-us;q=0.7,en;q=0.3
Accept-Encoding: gzip,deflate
Accept-Charset: windows-1251,utf-8;q=0.7,*;q=0.7
Keep-Alive: 300
Connection: keep-alive

HTTP/1.1 200 OK
Server: GoAhead-Webs
Pragma: no-cache
Cache-Control: no-cache
Content-Type: multipart/x-mixed-replace;boundary=myboundary


No longer I can check server push M-JPEG streams using FireFox, supposedly there is a configuration tweak to bring well known behavior back.

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