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How do I turn off the sound on ads which are on autoplay?

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There are ads on webpages that start playing sound for no reason at all and there appears to be no way to stop these sounds. So, I am forced to mute my computer until the ad stops playing which can be minutes or hours or until I find the webpage that is playing the sound. In IE, there is a way to turn off sound from webpages but I haven't found that in Firefox yet. Perhaps this is something you can fix.

There are ads on webpages that start playing sound for no reason at all and there appears to be no way to stop these sounds. So, I am forced to mute my computer until the ad stops playing which can be minutes or hours or until I find the webpage that is playing the sound. In IE, there is a way to turn off sound from webpages but I haven't found that in Firefox yet. Perhaps this is something you can fix.

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Try these about:config settings

media.autoplay.enabled user set boolean False
browser.sessionstore.max_concurrent_tabs user set integer 0

I notice that the second one for me is 3 (default), don't know if I changed it or or if Firefox did.

More information on configuration variables available in about:config (entries) and for users not familiar with the process there is about:config (How to change) -- Specialized list of only Tabs configuration variables.