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I use the keyboard shortcut ⌘1-⌘9 to switch to tabs in Firefox. In OS X every time I do this there's a sound, which can become annoying when the volume is turned up.

I looked in about:config for anything matching sound but wasn't able to figure it out. Does anyone know how to disable this sound?

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Nice question, I didn't even know that feature. Sadly, I can't give you a solution because I use windows where I can hear no sound while switching tabs by ctrl1-ctrl9 – Martin Oct 18 '10 at 8:41
up vote 2 down vote accepted

That’s certainly not a Firefox sound, at least not one that I’ve heard in the past.

  • Do you have any Extension? Try disabling them all for the sake of testing.
  • Any other application running that could be using the same shortcut? (Safari uses that to access the quick bookmarks where ⌘1 corresponds to the 1st on the left (next to Top Sites) and so on. However, the lack of bookmark, doesn’t produce a sound on my system. I even have “Play User Interface sound effect” checked in Sound Preferences pane.

My bet is that you have something else running and that is causing the “bonk”.

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Thanks for the pointer -- it's the Vimperator addon. I should have checked! – Mike Mazur Oct 18 '10 at 12:24
@Mike glad you found it! – Martín Marconcini Oct 18 '10 at 12:41

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