So it's the stuff sent to the Mozilla "health" servers and such, for browser crashes etc. These are just the object ID's, the actual objects are stored somewhere deeper in Mozilla as Javascript objects.
The folders will still be created, whether or not you allow firefox to send this telemetry. To disable it entirely, see here.
following the link, I will disable it for good, nontheless I don' t need it and updates of any kind did not work fine always. Thanks a lot for the hint and the link!!!!!!!!