WTH After editing a block on one tab, HA jumps to a different tab

Month of "What the heck?!"
1

I use about 10 tabs. When done editing a block on one tab, HA often (not always) jumps to a different tab. Upon returning to the edited tab, it is still in edit mode. Annoying.
It happens on mobile as well as PC, which suggests it is a problem on server.
I use a celeron4000 minipc as dedicated Home Assistant server. (HA OS)
To my memory it has always happened, even when I still used core or superviser.

2

I experience the same behavior in Firefox, it doesn’t happen in Chrome for me, maybe try a different browser, it might help

3 
  maybe try a different browser, it might help

Not noticed before. I use Chrome and Firefox and Opera randomly.