The phrase about observer being optional came straight from the IDL actually. --Nickolay 08:47, 30 November 2005 (PST)

I actually noticed this when patching a small crasher in loadOverlay, tho it happened after I submitted the changes here. The "optional" part's definitely wrong, tho (testcase). I'm not even sure that you can have optional parameters in XPCOM. --Waldo 13:23, 30 November 2005 (PST)

Optional in the sense that null may be passed.
I remember a bug that was caused by the fact that current implementation doesn't deal well with null observers, and agree with your edit; just had to mention that IDL says otherwise. --Nickolay 14:04, 30 November 2005 (PST)

I think that an example of relying on observers to run subsequent overlays would be in place in this article. Could you please add it? q0k 05 January 2010

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