Dup is a free Chrome add-on developed by across that falls under the category of Browsers and the subcategory of Add-ons & Tools. It is designed to help users stay up-to-date with forum topics by ensuring they always appear at the top of the forum.

With Dup, users can easily track specific topics and ensure they remain on the first page of the forum. This add-on is particularly useful for individuals who want to stay engaged in discussions and be aware of any new updates or responses. By using Dup, users can save time and effort by not having to manually search for their desired topic each time they visit the forum.