Audio file plays randomly drowning out everything else, can't track it down but closing Firefox cuts it short so it seems to be linked.
Any time Firefox is open, regardless of what site(s) I am on, it will randomly play this short audio file that fades out to inaudibility over about 15~20 seconds. It doesn't even happen on a regular schedule, sometimes every couple minutes, other times hours apart. I can't track it down but closing Firefox cuts it off instead of letting it play through.
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Separate Issue; Your System Details shows;
Installed Plug-ins
Shockwave Flash 13.0 r0 Shockwave Flash 15.0 r0
Having more than one version of a program may cause issues.
Grab the uninstaller from here: Uninstall Flash Player | Windows Uninstall Flash Player | Mac Then reinstall the latest version.
Flash Player v15.0.0. 239 http://get.adobe.com/flashplayer/
Start Firefox in Safe Mode {web link} While you are in safe mode;
Type about:preferences#advanced<Enter> in the address bar.
Under Advanced, Select General. Look for and turn off Use Hardware Acceleration.
Poke around safe web sites. Are there any problems?
Then restart.