trouble registering component twice...

[Phil H�hn]

Can I get some help? I'm doing file processing - I create an object 
which needs to validate the page URL. So this object implements 
Components.interfaces.nsIRequestObserver callback onStopRequest(...).

However if I create a second object (same type of class, i.e validate 
page URL and setup callback) then the first callback doesn't get called. 
Only the second one gets called. As you can imagine this is a major 
problem...

I'd assumed the XPCOM framework could support 2 different instances of 
the same object implementing interfaces and callbacks, but I've been 
told on IRC that this is not always the case. I.e some XPCOM objects can 
only be registered once. Is nsIRequestObserver one of them?
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