How can I turn off the background "music" without turning off sound?
I find the background tune is annoying, especially when the sound of the video or you tube tape is playing softly. I didn't finish taking a one-session class because the sound interfered with the lecture. Is there a way to get rid of it? I know how to mute the sound so that there is none, but I want to hear the sound associated with whatever it is I am playing without this underneath----and sometimes on top!
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Usually this means there is some media playing on a different tab. Unfortunately, Firefox doesn't have a built-in way to track down which tab it is.
I was not able to find an add-on to mute background tabs.
So... I think you might need to hunt down the source manually by checking all your tabs. Hopefully another volunteer will have an easier suggestion.
You can set plugins to are used to "Ask to Activate" on the "Firefox/Tools > Add-ons > Plugins" page to prevent them from starting.
There are also extensions like Flash Block.