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I appreciate to be warned when I try to close Firefox with multiple tabs open, but I really don't want to hear the warning sound. How can I disable the warning sound for Firefox?

3 Answers 3

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You either have to turn off all sounds for Window notifications or specifically stop Firefox from warning you.

To stop Firefox showing the warning, open the options and navigate to the Tab "Tabs" and uncheck the setting about warning when closing multiple tabs. If you would rather turn off all warning sounds open your indicator-sound in your indicator area in the top right, open the sound preferences and in the tab "sound effects" you can mute the warning sound level.

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    You are right! Pity, that one can't edit sound preferences for firefox only. Jun 7, 2011 at 13:29
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    It costs Mozilla nothing to put an option to turn on/off this sort of sound alone (not the warning itself). But, on the 40th version, they look to prefer "fresh novelties" over useful and stable options.
    – Rodrigo
    Aug 28, 2015 at 12:19
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Using the sound/volume indicator, click "Sound Preferences"

Under the 'sound effect' tab you can mute the alerts, or even turn off all window sounds.

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In Firefox, select Edit, Preferences, Tabs

Untick Warn Me When Closing Multiple Tabs

That will stop the warning sound, for actually closing multiple tabs that are open just close what you no longer need open.

Firefox Preferences

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    I actually want to be warned. Sometimes I unintendedly press on close cross. But I don't want the warning sound. Jun 7, 2011 at 13:27

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