For the package configuration, I need a Salesforce 'custom link'.
The 'custom link' has to open in a new window.
I tried it with following code but it does not work:
Edit: I tried it in a VF-Page, but it should also work in lightning.
Edit2: I have a strong feeling that it is not possible to use JS for a package configuration link (I tried the 'custom link' on the home tab and it was working there).