When I select a bookmark to open by right clicking, the bookmark becomes un-highlighted as the right-click menu is displayed. Which introduces a little uncertainty about which bookmark is actually selected. (I am elderly and my hands are shaky, causing the cursor to move around a bit).
Note that Firefox does not behave this way when selecting/right-clicking on a folder. The folder remains highlighted after the menu is displayed.
So, it would be nice if the highlighted bookmark remained highlighted even as the right-click menu is displayed, to confirm which bookmark will be opened.