PM is a Chrome extension developed by chris.parnin. It is a free add-on in the Browsers category under the subcategory of Add-ons & Tools. PM is designed to help users with prospective memory by allowing them to place reminders in specific browser locations.

With PM, users can set reminders that are contextually relevant to their browsing activities. This extension is particularly useful for tasks like sending a message in Gmail, making notes on a web app, managing a GitHub project page, or even leaving personal reminders on non-work-related websites like Reddit or Hacker News.

By providing a digital equivalent to physical reminders, PM helps users remember to perform future actions while they are engaged in their online activities. This Chrome extension offers a convenient and accessible way to enhance prospective memory in the digital space.