youtube audio goes off when i try to speed up the speed of playback on safari

i have a mac and this only happens on safari when i change the speed setting

it does not happen in chrome

how to fix this??
brian ramdhaniCT Technician Asked:
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Odd. The sound doesn't go off in my copy of Safari when I speed up YouTube videos to 2x. I am using Safari 9.0 on OS 10.10.5. Which version are you using?
brian ramdhaniCT Technician Author Commented:
same version as you and i am on el capitan

could it be an extension causing this??
Or a plug in. You could try disabling both.

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