Rated 5 out of 5 stars
me again - just to say: it is possible to open download history in tab, it is just well hidden ;)
So: click on the "downloads" header in "Full mode", choose "download history", then "options" again (in that new window), now, it is possible to define "Behavior" as open in "Tab".
So - sorry for jumping the conclusions :)
Thanks again. Here goes 5 stars again!