The ID of the extension that changed the muted state. Not set if an extension was not the reason the muted state last changed.
Whether the tab is prevented from playing sound (but hasn't necessarily recently produced sound). Equivalent to whether the muted audio indicator is showing.
The reason the tab was muted or unmuted. Not set if the tab's mute state has never been changed.
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Tab muted state and the reason for the last state change.