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I don't think there should be more than one. What happens when you quit Safari? Do they both come back?
I mean you should have Safari and then a Safari Web Content. Maybe a Flash mention if you use it.
 
I've seen this since the upgrade and if you kill the process, you kill safari. Web content tends to crash when clicking on links.
 
Since 6.0.2?
I really don't know what their doing with Safari. It has a loooot of bugs.
I think that after you empty cache it's ok.
 
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