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a sound like a siren comes on when I go to start page

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upon start, a continuous sound like a siren comes on. it is followed by the sound that indicates one of the "guys" in pac man has died, and then continues. I want it to stop - please help.

This happened

Every time Firefox opened

upon start, a continuous sound like a siren comes on. it is followed by the sound that indicates one of the "guys" in pac man has died, and then continues. I want it to stop - please help. == This happened == Every time Firefox opened

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We were able to resolve the issue by disabling the "Cool Preview" add-in. Mac OSX 10.4

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Re Siren sound - on windows XP