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Random firefox sound,what to do?

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Well,when I go to the volume mixer the sound icon for firefox keeps flashing so as a result some youtube videos have sound,others not and some have distorted sound.

Well,when I go to the volume mixer the sound icon for firefox keeps flashing so as a result some youtube videos have sound,others not and some have distorted sound.

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Right click the volume icon, choose Open Volume Mixer from

the pop-up menu. You will see the
audio device and various apps in the
Volume Mixer. Make sure the slider 

for Mozilla Firefox is not muted or at the bottom. Restart the Firefox browser and try to play any embedded videos online again.

https://support.mozilla.org/en-US/kb/fix-common-audio-and-video-issues