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I too will not install add-on that the author can't describe in layperson terms.

I found this link :

<a href="www.api-exploration.net/mashups/wikipedia-roll/info_en.php">wiki-roll</a>

which MAY be the same thing that this ad-don does. So I guess this ad-don scans the wiki page and for the starting paragraphs and by each wiki section grouping to create a visual representation of the links in that section.

Am I right? If so how does this helps with research? If not then what does it do?

Untested and rated poor for documentation.