Mori is a Chrome extension that embodies the philosophical concept of "Memento mori," reminding users of life's finite nature. When opening a new tab, Mori visually displays the passage of time in days, weeks, months, or years, with past intervals marked by skull emojis and future intervals by rose emojis. The extension employs symbols of a clock, skull, and rose to symbolize time, death, and life, drawing on historical significance such as Phillippe de Champaigne's vanitas.

By prompting users to input their birthday and life expectancy, Mori customizes the visualization to the individual. Users can choose their preferred time unit (days, weeks, months, or years) for tracking purposes. The settings page can be easily accessed by clicking on the extension's icon, offering a personalized and reflective experience.