XULSortServiceImpl::~XULSortServiceImpl does if (gXULSortService) { nsServiceManager::ReleaseService(kXULSortServiceCID, gXULSortService); gXULSortService = nsnull; } This assumes that the service manager is actually holding a refeence. In a simple case where the sm is *not* holding a reference then is can cause the equiv. of NS_RELEASE(this) when this mRefcnt == 0 and an assertion rightly follows. At minimul, I sugges that you change the conditional to: if (gXULSortService && gXULSortService != this) But I'm unclear how this gRefCnt can go to 0 if the service manager *does* still hold a reference? I'm running code in xpcshell to create and release this progid and see the failure. Does apprunner every actually call this code in the dtor? in xpcshell one can run: var name = "component://netscape/rdf/xul-sort-service"; try { var foo = Components.classes[name].createInstance(); print(foo); foo = null; gc(); } catch(e) { print("caught+e"); }

Fixed.

QA Contact massive update.

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