Also, I added back/forward support to org-info-js (along with a GPL license) here: https://github.com/cosmicexplorer/org-info-js. I haven't used it in a bit, but feel free to take the code e.g. from https://github.com/cosmicexplorer/org-info-js/commit/d72b310... if you're looking to improve the default org-info-js situation.