Replace Missing Favicon is a free Chrome add-on developed by pconerly. It falls under the category of Browsers and specifically the subcategory of Add-ons & Tools. This program aims to provide a solution for websites that are missing a favicon.

One of the main features of Replace Missing Favicon is its ability to generate a random gravatar for websites that do not have a favicon. By doing so, it ensures that the provided avatar remains consistent for a given domain across pages and across users. This adds a visual element to websites that would otherwise appear generic without a favicon.

Overall, Replace Missing Favicon is a useful tool for web users who value consistency and aesthetics. Its free license makes it accessible to a wide range of users, and its integration with Chrome makes it convenient to use. If you come across websites without favicons and prefer a more personalized browsing experience, this add-on is worth considering.