> + > + > + JS::Rooted<JSObject*> jsImplObj(cx); > + nsCOMPtr<nsIGlobalObject> unused = ConstructJSImplementation(cx, "@mozilla.org/push/PushManager;1", > + global, &jsImplObj, aRv); This is going to fail miserably on workers when we expose ServiceWorkerRegistration on workers (Bug 1131327). Could you file a follow-up and add a comment with the bug number here? The easy solution is that for workers we create a C++ PushManagerProxy that routes calls to their equivalents on the main thread (see DataStore comparison in dom/workers/DataStore.{h,cpp} and dom/datastore)

Bug description is summary of https://bugzilla.mozilla.org/show_bug.cgi?id=1038811#c50