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The problem with Firefox has nothing to do with Flash. It has the same problems when using HTML5. It's about how it handles the stream. I read an in-depth article on it a long time ago - I can't remember much of it, but it came down to this. It saves the stream to cache periodically, like every few seconds. It doesn't do this asynchronously, so it actually interrupts the stream. Depending on how long that takes, it might or might not be enough to cause the playback to pause for a fraction of a second.