Just as simple as the title says — an option to only show the bookmarks bar when the toolbar is hovered. Maybe show the default bookmark bar show/hide animation to make it more logical and eye-pleasing.
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Similar idea here: Show / hide button for bookmarks bar
I would like a function/option that the toolbar will automatically be shown when the address bar is selected.
I often use ctrl-L to select the address bar but the toolbar is only shown on a new tab.