GeckoFx And XULRunner to use firefox as webbrowser

Basic4Life said:

When one uses "browser" as object in the Marshal.Release method it errors, saying it's not a type of __COM object.

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That's correct. Marshal.Release works on an IntPtr to the IUnknown interface of the COM object which you obtain with Marshal.GetIUnknownForObject.

I'm not very good at COM Interop as I've only used it a few times (and that is few years ago now) and I know nothing of the possible differences between COM and XPCOM so I'm out of ideas now. My last desperate suggestion is to try a call to GC.Collect after Marshal. ReleaseComObject or Marshal.FinalReleaseComObject