Well, I’m not saying that you should copy this feature, but on LP you can cycle between them (already filling in) by pressing Alt+PageUp/PageDown.
I like this and some other hotkeys that are set by default, like Ctrl+Alt+H to open the (local) vault (by calling up the Chrome’s extension page), Alt+W for quick search on a separate tab… These are the ones I use most.
Probably a shortcut to edit the website domain/username/password would be formidable. Now it’s up to you if you want to make this by calling up a tooltip or on a separate (new) tab.
For example: you press Shift+Alt+PgUp/PgDwn to show up the desired login you want to edit (press again if you want to cycle between them) and when you release you end up by editing the info on the pop-up or on a new tab. That would be fine to me.