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no sound when using youtube. itunes play just fine

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http://www.youtube.com/results?search_query=statler+brothers&oq=statler+brothers&aq=f&aqi=&aql=&gs_sm=e&gs_upl=4380l6884l0l7383l16l8l0l0l0l0l0l0ll0l0 - no sound from external speakers

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See the entire article but start with "No Sound in Firefox" bring

http://kb.mozillazine.org/Video_or_audio_does_not_play#No_Sound_in_Firefox

that part about the "sound mixer" is written for Windows, wouldn't know how well that might relate to a Mac but in Windows each application has some control to provide less sound than the main control or to be muted.