On Fri, Oct 11, 2013 at 10:24 AM, Matthew Gertner
<matt...@salsitasoft.com> wrote:
> On Thursday, October 10, 2013 7:23:44 PM UTC+2, Boris Zbarsky wrote:
>> Seems unlikely.
>
> Indeed, I completely misdiagnosed the issue. Upon further investigation it 
> turns out that the external script is trying to set a property on a chrome 
> object and that __exposedProps__ does not allow this. So completely normal 
> behavior.
>
> What I can't seem to figure out is how to make it so that content can add new 
> properties to a COW (as opposed to modifying existing properties). Totally 
> different question, I know, but is this possible?

It's not really, and COWs are deprecated. What kind of object is this,
and why does content need to modify it?
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