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prime and youtube

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‘I made some adjustments in settings & I don't remember them but Amazon Prime and YouTube don't come out of buffer’

‘I made some adjustments in settings & I don't remember them but Amazon Prime and YouTube don't come out of buffer’

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How about getting a Fresh start. Refresh Firefox - reset add-ons and settings

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I'm on 7 using 115.5ESR with no issues. see screenshot

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An easy way to test a new profile is to install Developer Edition (without signing in to sync account) and see if it happens there.

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Could the settings be related to autoplay or DRM?