Found it. No help necessary. Sorry to bother you.
Still the question – but without any urgency – whether there is a better way than this. I am an IT-Guy but no Webprogrammer, so an info “where to change what2 would suffice.
Thxs
After some additional testing I recognize, that the effect is *only* via Mozilla, not Chrome oder Safari.
So the cause is obciously related to something happened within Mozilla and is not of your concern.
But neverthelesse any idea oder hint would be much appreciated.
Maybe, after many years and several versions there is another/better way to remove this unwanted blank lines that works for all browsers?
