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org.mozilla.gecko.util.NativeJSObject$InvalidPropertyException: Property does not exist at org.mozilla.gecko.util.NativeJSObject.getString(Native Method) at org.mozilla.gecko.AccountsHelper.handleMessage(AccountsHelper.java:150) at org.mozilla.gecko.EventDispatcher.dispatchEvent(EventDispatcher.java:223) at org.mozilla.gecko.GeckoAppShell.handleGeckoMessage(GeckoAppShell.java:2275) at org.mozilla.gecko.mozglue.GeckoLoader.nativeRun(Native Method) at org.mozilla.gecko.GeckoThread.run(GeckoThread.java:436)