They don't necessarily just play on startup, either-- I ran into one where a window I'd had open for days to the same page just suddenly started playing audio, and I couldn't figure out why. I've found that going through and refreshing each tab and seeing if there's an interruption in the noise is the quickest way of figuring out where it's coming from, but that really shouldn't be *necessary*.
(no subject)
Date: 2013-08-06 03:52 pm (UTC)