Shared components used by Firefox and other Mozilla software, including handling of Web content; Gecko, HTML, CSS, layout, DOM, scripts, images, networking, etc. Issues with web page layout probably go here, while Firefox user interface issues belong in the Firefox product. (More info)
We don't really do anything with message from org.freedesktop.dbus, and we get a lot of NameChanged message when in debug. Remove the listener for this and make sure all log messages are set to DEBUG only anyways.