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This Firefox add-on works great for that: https://addons.mozilla.org/en-US/firefox/addon/headingsmap/developers?src=api It works on any web page, i.e. also on the sage notebook and opens a side bar with all headings listed hierarchically. It allows to navigate to each heading just by clicking on it. To activate, right-click in worksheet and activate HeadingsMap. It does make switching between tabs a bit slow, so it is best to open worksheets in separate Firefox windows for that.