[ot] HTML5 document outliner add on for Chrome

"Generates a navigable page outline with heading and sectioning elements

This extension is using the HTML5 outline algorithm to create a table of 
contents. Should also work well with HTML4 (and older?) pages, that have 
structured headings. The table of contents is clickable and tries to 
highlight the heading/section in question after the jump."

https://chrome.google.com/webstore/detail/afoibpobokebhgfnknfndkgemglggomo