As Vivaldi is Chromium-based, maybe you can change KM preferences to us it.
If you don't want to do that, then you can maintain a macro that always stores Vivaldi's URL as a global variable, triggered by window change.
As Vivaldi is Chromium-based, maybe you can change KM preferences to us it.
If you don't want to do that, then you can maintain a macro that always stores Vivaldi's URL as a global variable, triggered by window change.