No sound when using Firefox. Itunes and Quick Time work fine

Your Firefox Plugins are quite older you need to update them. -> Update All your Firefox Plugins * https://www-dev.allizom.org/en-US/plugincheck/ * http://www.mozilla.com/en-US/plugincheck/ * '''When Downloading Plugins Update setup files, Remove Checkmark from Downloading other Optional Softwares with your Plugins (e.g. Toolbars, McAfee, Google Chrome, etc.)''' -> Restart Firefox Also perform the suggestions mentioned in the following article: -> Clear Cookies & Cache * https://support.mozilla.com/en-US/kb/Template:clearCookiesCache * [[No sound in Firefox]] Check and tell if its working.