Works over all Windows

[MaMiKoe]

Thanks for it, it works.
But: IMHO the function should be "limited" to one - the just open - Chrome-Window. So that it is still possible changing with Alt-TAB between two Chrome-Windows w/o touching the possibility changing in each Window between the last two active Tabs.
So, as it is, the function works allover Chrome and covers every open Chrome-Window, so that the last two active Tabs can be in different Windows. And when changing the Windows with Alt-TAB the active Tab in the now active Windows acts as of the last used Tabs.
This funtions all over Chrome/alle Chrome-Windows is not necessary because when the last two used Tabs are in different Windows the changing is already possible with Alt-TAB.