Why does QuickTime lag in Firefox if I don't put my mouse over it?

Posted by Jim McKeeth on Super User See other posts from Super User or by Jim McKeeth
Published on 2009-09-05T05:16:46Z Indexed on 2010/03/26 4:23 UTC
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quicktime

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firefox

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apple

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Performance

This has happened for me as long as I can remember. Since the first version of Firefox, on multiple computers and under different versions of Windows. QuickTime plays fine in IE and Chrome (even with Firefox in the background), but in Firefox if my mouse is not over the QuickTime window then it will start to studder, then lag and eventually just stop.

To be honest, I do keep quite a few tabs open, but Firefox stays at 1% CPU (even when QuickTime runs) and I have a few gigs of free RAM.
It is the same for any resolution of video or audio.
If the mouse is just one pixel in the client area of the QuickTime then it usually plays fine.
Other video formats typically play fine.

Does anyone else notice this behavior? Ultimately I would like a fix besides keeping my mouse over the QuickTime window.

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