Tags for Google Calendar is a Firefox add-on designed to improve event organization within Google Calendar. This tool modifies the appearance of event names by introducing color-coded tags for better visual categorization. Events labeled with a colon (:) will display the tag in a vibrant color, making it easier to identify different types of activities at a glance. For instance, an event titled "Tag: Event name" will appear as "[Tag] Event name," enhancing clarity and efficiency without the need for multiple calendars.

Additionally, the add-on offers a unique feature for events ending with a question mark, rendering them in italic and transparent. This visually indicates that these events are optional or pending confirmation. As of the latest update on February 27, 2024, Tags for Google Calendar also supports the embedded version of Google Calendar, providing users with a seamless experience while managing their schedules.