OK, more detail. I understand typing into the URL field. That works well, and I regularly use it, for example, by typing 'Hank' into the URL field. But this not what I am wanting.
I'm sorry that I can't find the "Add Active Tab" dropdown anywhere in the menus or in the Help files. But I have over 2000 Favourites bookmarks in that I regularly transfer to Firefox, so I can't possibly edit each one.
What I am wanting is this (after using Ctrl B to open the bookmarks menu):Type 'R' to go to the first menu folder or item beginning with R --- in this case the 'Retail' folder. Then type 'F' to go to the first menu folder or item beginning with F --- in this case the 'Food' folder. Then type 'H' to go to the first menu folder or item beginning with H --- in this case the 'Hanks' URL.
The beauty of this approach is that the menu opens up as you go, allowing you to see all your URLs and folders at each stage and select the one you want. I can navigate to any of my over 2000 bookamrks with only a few keystrokes.
Of course I can use the up-down arrows as well, but using the letters saves a lot of time. And in Vivaldi at the moment, it takes 14 taps on the Tab key to get the cursor into the menu.
As I said, my only intention is to support Vivaldi by recommending a simple feature that is extremely useful to me in Firefox and IE. I posted this thread because the Vivaldi website invited users to make such recommendations.