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not sure if a plug in problem or something else but no audio with you tube and pandora but have audio with itunes and windows media player and internet explorer; plug ins up to date

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please advise- checked plug ins and up to date per mozilla site but no audio with you tube, pandora, email video clips. Have audio with itunes, windows media player, and internet explorer. Previously had audio so this is a new problem over past week or two. Thanks

please advise- checked plug ins and up to date per mozilla site but no audio with you tube, pandora, email video clips. Have audio with itunes, windows media player, and internet explorer. Previously had audio so this is a new problem over past week or two. Thanks

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See:

You can click the Volume icon on the Windows Taskbar near the clock and click the Mixer link at the bottom to open the mixer.
You can adjust the volume level for each application in that window, so make sure that Firefox is not muted or set at a low level.
Current Firefox versions use the plugin-container process to run plugins, so you need to check the volume setting for the plugin-container process.
You will only see the Firefox program or the Plugin Container in the Mixer if you are on a website that plays sound.