Custom Bookmark Favicon is a Firefox extension designed to enhance the visual organization of your bookmarks. This tool enables users to set custom favicons for their bookmarks, allowing for easier identification of sites, particularly useful for distinguishing between various email accounts or frequently visited pages. Unlike other extensions, it supports the bookmarks bar through a stateless AWS Lambda API, which serves the custom favicon and redirects to the intended webpage. This unique feature ensures that bookmarks are functional even when offline, as the browser caches the favicon for an entire year.

The extension operates under a subscription-based model but remains free for users as long as the total usage stays below 24 million requests annually. Users can contribute any amount if they find the extension beneficial. Additionally, support is readily available for troubleshooting, with a commitment to respond to any inquiries within 48 business hours. Overall, Custom Bookmark Favicon is an innovative solution for Firefox users seeking to personalize their browsing experience.