- Open Windows 10 Event Viewer.
- Start Firefox.
- Refresh Event Viewer.
Two DCOM 10016 warnings appear:
The application-specific permission settings do not grant Local Activation permission for the COM Server application with CLSID
to the user <USER> from address LocalHost (Using LRPC) running in the application container Unavailable SID (Unavailable).
This security permission can be modified using the Component Services administrative tool.
The CLSID and APPID correspond with the RuntimeBroker. More of these warnings appear when visiting sites that have videos such as youtube.
Regressed by Bug 1521370.