@vux777 Thanks for the prompt reply! Appreciated. Fingers crossed that it may be resolved.

Ever since I upgraded to Opera Version :69.0.3686.36, drag-and-drop for bookmarks systematically generates error messages. Never had that before. Bookmarking only works the first time around, by remembering to right-click the extension and clicking "new bookmark" or "boomark inside". Can you help? Not sure what I could be doing wrong.