Only Download Helper:
The others cause error with things like:
Fehler: Components.classes['@mozilla.org/extensions/manager;1'] has no
Means that we do not have that Firefox Function at all
Fehler: DWHelper_popupShowing is not defined
This is IMHO a basic chrome functions from Firefox. We simply do not have that.
Or tells You that it will not convert Location.toString because calling that method has been denied. No idea what that is means