How do I change the Library highlight color for a folder (left panel) to make it more visible while working in the right panel on bookmarks?

When I am working with many bookmarks in the right Library panel, I can't see well the highlight color for the folder I'm working in on the left panel. With folders organizing similar website bookmarks, I need to see clearly the highlighted folder on the left. The current color is too dim. Is there a setting in about:config or somewhere else that needs to be tweaked to adjust it?

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