Mozilla Help: How do I disable the sound that plays, when I use the "Find As You Type" feature?

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Mozilla Browser FAQ

Last updated on November 3, 2004.

How do I disable the sound that plays, when I use the "Find As You Type" feature?

Add the following line to your user.js file:

user_pref("accessibility.typeaheadfind.enablesound", false);

Or you can enter about:config in the location bar.
Search for the preference accessibility.typeaheadfind.enablesound.
Modify the value to false.