Breadcrumbs path forward and back

I've noticed request for a forward/back navigation for the PDF view/reader. That would be fine, but my desire would be to have a "bread crumb" ability within a library as a whole. When you have a complex collection hierarchy it is very frustrating to so easily lose your way when doing ad-hoc research in the library.

Is there such a mechanism?
Is there a plan for such a mechanism?
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