Hi Doug, thanks for sharing your feedback. I am always happy to know that the extension is useful and also to have this kind of feedback that gives additional ideas of features that it could include.

Regarding your suggestion, right now there is a visual clue that can help to identify the header. Maybe it is not the best way, but I think it could help. If you go to the settings dialog, you'll find one option with the label "Relate with viewport". When it is active, besides each item in the list of headers, at the right, you'll see a grey line that, when you scroll in the page, visually identify the headers (or sections) that are in the viewport area. When writing this comment I am thinking that maybe it is not the best name for the option. I also think that it can be far from your suggestion, but maybe it can help a bit.

Anyway, I just included your suggestion in the to-do list that I have: https://rumoroso.bitbucket.io/headingsmap/todo.html I have to say that some of them have been in the list for some months, so I cannot ensure when are going to be implemented, but at least it is a place to not forget them.

Again, thanks for your comment and your feedback