Music plays when I open Firefox browser

Whenever I open Firefox browser music begins playing. I have also sometimes heard non-musical audio, what sounds like a commercial.
I checked the add-ons/plug-ins list of Firefox and nothing on it seems to be the source of this problem.
I also already checked the installed programs from my computer's Control Panel. But there is nothing installed recently that would explain this unwanted audio playing upon opening Firefox.
And this unwanted audio only plays in Firefox, not when I use Internet Explorer browser. But I prefer Firefox overall, so hope I may find a remedy to this situation.
I have also uninstalled and reinstalled Firefox, but the problem will not go away using that measure either.
And when I have tried a System Restore of my hard drive the earliest date is this morning, which does no good as this problem was also there yesterday.
My Operating System is Windows 7 64-bit. I am using an HP Pavilion dv4 Notebook PC.
Please advise on what is a solution to this issue.

Perchance, were you using a Video Downloader add-on?
Maybe a video got "stuck" in the download cache and was replaying when Firefox was opened.

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Hi everyone!
I will be posting this in all "weird sounds topics" just so you know.
These "weird" sounds you hear are from pacman.
Today is Pacmans 30:th birthday and google wanted to celebrate by making the pacman game playable at their website "www.google.com".
You will notice that their logo is changed to pacman with the map swapped out to the text "google".
The game will probably just be here today so all noises will be gone by tomorrow. If you don't want to hear the sound today then please don't visit google or just turn your volume down.
Yours sincerely: LAwLz

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Yvan KOENIG (VALLAURIS, France) vendredi 1 avril 2011 21:25:39

Music plays when I open Firefox browser

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