Firefox won't play sound on youtube video's but sound works in other applications

i can play sound as usual on other applications such as media player, vlc, itunes etc... but firefox and internet explorer do not work, google chrome doesnt even work. i have re-downloaded flash player and the pluggins many times trying to fix it, cleaned out my pc with ccleaner, anti-virus checked and such. i just cant fix it. i have before but i forget how and it always happens again after a while, especially just after pulling out speakers or headphones from the jack.
== This happened ==
Every time Firefox opened
== it just keeps happening, has been for months and months

Try clearing the Cache in Firefox.
Tools-> Clear Recent History -> [v] Cache
or
Tools->Options->Advanced->Network -> Offline storage -> [Clear Now]
Youtube may have made some changes recently. Clear the Youtube cookie and refresh page if above does not do it.

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