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Here is the situation:

While watching a youtube video, sometimes, the sound will stop working (even the beggining of the video, which I saw WITH sound, no longer plays the sound) but the image still works (video keeps playing) Simply restarting firefox solves the issue..

update: same problem occurs in epiphany (another web browser available for ubuntu) Restarting epiphany also solves the problem..

fyi: I use Firefox 3.5 on Ubuntu 9.10 Karmic koala

If there is anything more you need to help me out, I'll edit it in this post.

Thanks in advance!

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Same thing happens to me - be nice to figure out how to fix it. – chris Dec 17 '09 at 21:11
I'm not sure about this one, but the problem seems to have stopped as I solved a wireless connection issue (see this thread:…). The solution was to install wicd as a replacement for NetworkManager... Maybe this will work for you as well? – Shawn Dec 18 '09 at 3:02

I recommend you upgrade to Firefox 4.0.1. also, use the SmartVideo Addon. It'll help. You may also try the Youtube HTML5 mode.

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