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Firefox 4 has massive delay opening a new tab with audio content, Firefox 3.6.16 opens the same link instantly, why?

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When I open a new tab to stream an audio mp3 file from the server. Firefox 3.6.16 streams the audio instantly, Firefox 4 has really long delay with just white blank page, befor it comes with QT player. why?

When I open a new tab to stream an audio mp3 file from the server. Firefox 3.6.16 streams the audio instantly, Firefox 4 has really long delay with just white blank page, befor it comes with QT player. why?

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I've been searching for a solution for this for months. Frankly, I'm sick of Mozilla ignoring this problem, which has persisted from version 4 through 6. Makes me ill.

The content is actually downloading, but Firefox hides the content until the entire file is downloaded. It used to display and allow you to play the partially downloaded content. Safari does this with ease. If someone can point out the parameter in about:config that controls this, I'd be grateful.