My you tube does not have any sound, i used to have it before, did i accidentally turn the sound somehow?

i used to be able to listen to youtube on my laptop, but now i can only see the images, no sound.

sound problems:
#Restore speaker icon to System Task bar, right-click on clock or tray > Properties > Volume: On
#Click on the Sound icon in System tray then on Mixer, make sure Firefox is not muted [http://dmcritchie.mvps.org/icons/fx_sound.png picture]
<p>Additional references
* [https://support.mozilla.com/en-US/kb/No%20sound%20in%20Firefox No sound in Firefox | Troubleshooting | Firefox Help]
* [http://support.mozilla.com/en-US/kb/Video%20or%20audio%20does%20not%20play Video or audio does not play | Troubleshooting | Firefox Help]
* [http://kb.mozillazine.org/Video_or_audio_does_not_play Video or audio does not play - MozillaZine Knowledge Base]

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