Why i cannot hear audio in firefox web browser only?

no web sounds on video sites in Firefox browser, but no problem in Internet explorer, what is the reason?

See:
* https://support.mozilla.com/kb/No+sound+in+Firefox
* https://support.mozilla.com/kb/Video+or+audio+does+not+play
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.<br />
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.<br />
Current Firefox versions use the plugin-container process to run plugins, so you need to check the volume setting for the plugin-container process.<br />
You will only see the Firefox program or the Plugin Container in the Mixer if you are on a website that plays sound.<br />

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