Wikipedia Category Tree Explorer

Can be viewed in the sidebar, and/or in one or more pop-out windows. some other options: - show/hide the categories of the current page, if that page is a wikipedia page, and if it has any non-hidden (non-maintenance) categories - show/hide an inverted tree view (makes it easier to traverse up the "tree", since it's not actually a strict hierarchy (categories can have multiple parents, and there are some cycles)): - dark/light mode github: https://github.com/Caseythezahima/wikipedia-category-tree-explorer