Service Worker Blocker is a free Chrome add-on designed to enhance browser performance by managing Service Worker registrations and Cache Storage on specific domains. This tool is particularly useful for users who encounter issues with stale content or excessive disk usage due to aggressive Service Worker implementations on certain websites. With the ability to maintain a blocklist of domains, users can effectively disable these APIs on their chosen sites.

Key features include a domain blocklist that syncs across Chrome profiles, support for wildcards, built-in and custom presets, and a one-click option to add the current tab's domain. Additionally, it offers per-domain cleanup options to unregister Service Workers and clear caches, as well as a bulk cleanup feature for all blocked domains. The add-on is lightweight, does not perform background network requests, and is fully open source, making it an efficient tool for browser management.