HeadingsMap
HeadingsMap generates an index of any web document structured with headings and sections. It shows the headings structure, the errors in the structure (ie. incorrect levels), and it works as HTML5 Outliner too.
Installation
Link to heading "Installation"Firefox
Download HeadingsMap Firefox extension from Mozilla Add-ons and install it.
Microsoft Edge
Download HeadingsMap Edge extension from Edge Add-ons and install it.
Chrome
Download HeadingsMap Chrome extension from the Google Web Store and install it.