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Mute tab seems to be enabled by default now, so they must have changed their minds a while ago.

EDIT: Found an article: https://venturebeat.com/2015/10/20/you-can-now-mute-tabs-in-...

As far back as Sept. 2014 chrome://flags/#enable-tab-audio-muting was available in dev builds. I think I've probably had it enabled for about as long.

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