On Jan 1, 2015, at 10:31 PM, Bobby Holley <[email protected]> wrote:
> 
> It indicates the GC region that the sandbox will be placed in. It has no
> effect on correctness, but memory usage will be better if globals which die
> at the same time are allocated in the same zone. This is why content
> scripts pass the window they run against for "sameZoneAs" - both the
> content and the content script will get cleaned up at the same time.

I've added a bit to 
https://developer.mozilla.org/en-US/docs/Components.utils.Sandbox#Sandbox_options
 to cover this option. I see there are other not-yet-documented options, too, 
but I didn't get into them.

Eric Shepherd
Developer Documentation Lead
Mozilla
http://www.bitstampede.com/

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