Steam Activity Filter is a free Chrome add-on developed by ZeroUnderscoreOu. As the name suggests, it allows users to filter their friends' activity in Steam. With this add-on, users no longer have to scroll through the entire Steam friends' activity feed to find a particular event.

The main features of Steam Activity Filter include the ability to load activity for selected days and display only the desired part of it. Users can filter the activity for any specific day and for any player or group, making it easier to find the information they are interested in.

This Chrome add-on is a valuable tool for Steam users who want to streamline their activity feed and quickly find relevant updates from their friends. With its intuitive interface and efficient filtering capabilities, Steam Activity Filter enhances the user experience on Steam.