This is close to perfect and might gain popularity (from me) when I learn to
use it further.
For the moment it solves my problem in a two step action: First I have to
open a list of short cut, then choose the desired short cut.
Short cuts can open a given url or javascrpt (bookmarklet) in three diffeent
ways:
In the tab you're in now, in a new tab or in any tab already at the given
url/javascript.
Creating a list of short cut to the sites you most often visit will probably
ease your browsing experience.
Thanks for the tip