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Re:Everyone can now track down noisy tabs by ketralnis on Tuesday January 14, 2014 @06:49PM (#7060653)
I have this problem about once a day. It's usually a flash advert or other such nonsense.
Re:Everyone can now track down noisy tabs by pavel_lishin on Tuesday January 14, 2014 @09:56PM (#7061380)
Flashblock and Adblock are useful for preventing this.

Unfortunately, I don't know how to stop HTML5 videos from auto-playing.

Re:Everyone can now track down noisy tabs by mbrubeck on Wednesday January 15, 2014 @12:11AM (#7061774)
In Firefox, the "media.autoplay.enabled" pref can be used to disable the "autoplay" attribute for the <video> element. (But I think it may still be possible for pages to auto-start videos using JavaScript.)