To all, there seems to be quite a lot of things going on.
The update I did yesterday not only changed the download chooser
Sorry I can not show how it was earlier, all systems here are updated.
There was also the drawing in of Thunderbird as reported in another topic: Mozilla-Firefox security update draws in Mozilla-Thunderbird as a dependancy - #2 by dcurtisfra
And today there is again a new security update which creates havoc: Security Update: Updating kmozillahelper keeps failing - #5 by hcvv
Pfui.