The Bookmarklet pops an empty window on Vivaldi

Hi there,

I want to use the Bookmarks app as a substitute to Google online bookmarks,

The Bookmarklet works fine in Firefox, pops a form to fill in, simple an clean,
but on Vivaldi, pops an empty window, no form to fill in.

I allowed popups and java in Vivaldi, still an empty popup, any other Vivaldirians arround?

In the config options, are suggestion for 3rd party browser extensions, I could manage with those, is anyone using them?