Scroll to header: Ctrl-Up/Down to scroll to the previous/next highest header title; Ctrl-Left/Right to scroll to previous/next header (what is considered a header can be adjusted with XPath).

Each first navigation in a series pushes the mark, to return to that place use Ctrl-Home. You can also mark current position with Ctrl-End.

If order of headers is changed (due to layout change, etc.), use "Update header list" user menu command.