Extension Update Monitor is a Chrome add-on designed to track and notify users of any changes to their installed extensions, including updates, installs, and uninstalls. By default, the tool maintains a log file that records these activities, ensuring users are informed of any modifications to their extensions. This extension serves as a modern alternative to older tools such as 'Extensions Update Notifier' and 'Extension log,' which may not be updated to the latest web standards.

Users can customize their experience by selecting specific extensions that trigger notifications. The extension offers a button badge counter for quick updates and includes an option for audio alerts upon extension changes. A dedicated toolbar button provides easy access to recent updates and a detailed log page, which can be opened through right-click options. Additional customizable settings are available in the Options page, enhancing user control over notifications and logging.