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YouTube videos have no audio + placing my cursor on the video screen area causes flickering

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Using macOS Version 11.0 FF 78.0.2

1. When attempting to watch YouTube videos, there is no volume. -have confirmed volume is not muted on YT -computer volume is on high

2. Video gets jumpy when the cursor is placed on the YouTube video area.

Using macOS Version 11.0 FF 78.0.2 1. When attempting to watch YouTube videos, there is no volume. -have confirmed volume is not muted on YT -computer volume is on high 2. Video gets jumpy when the cursor is placed on the YouTube video area.

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Try:

Are there media related messages in the Web Console ?

You can try to disable hardware acceleration in Firefox.

Close and restart Firefox after modifying the setting for changes to take effect.