How do I turn off the camera shutter sound everytime something loads?

I keep getting a camera shutter type sound when on pages like Google, or hotmail, or any "active" page, loading pictures on websites for instance. Sometimes when things are happening rapidly it becomes a distorted cascade of the sound, like a loud chirp or worse. You can turn the sound down using the usual device sound but then, of course you can't listen to any music or anything else for that matter. It's extremely annoying and now that I synchronised my laptop with my desktop they both have the same problem. I've checked all the settings and can't find a way of disabling it. I don't exactly know what is triggering it but it seems to be when something is loading. I'm running firefox 18.0.2 on a Mac running Snow Leopard 10.6.8. Anything else I can tell you?

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