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error sound on mac when switching tab with cmd+right arrow
On Firefox 3.6.9 and OSX 10.6.4, when I switch to a tab to the right using cmd+right arrow, I get an error sound but Firefox successfully switches to the tab. The error sound is the same sound you get when you press a keyboard shortcut that doesn't exists (ex: cmd+?)
However, if I use cmd+left arrow I don't get the error sound.
How can I eliminate the error sound?