[Bug 732572]

[Chris Coulson]

nsISound.play() will throw that error if libcanberra can't be loaded.
Not being able to load libcanberra is also what causes the 'Gtk-Message:
Failed to load module "canberra-gtk-module"' error from GTK when it
initializes.

Are you sure you're not doing something like running a 32-bit build on
64-bit arch. Perhaps try running it in strace to see what is going on?

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https://bugs.launchpad.net/bugs/732572

Title:
  New Mail Notification Sound does not play in Natty

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