Simple Aquarium is a Chrome browser extension that allows users to create a virtual aquarium in the side panel of their browser. This add-on features swimming fish that can be interacted with by clicking within the aquarium, offering a simple yet engaging experience. The extension is primarily designed for those interested in learning TypeScript and JavaScript, making it a unique tool for educational purposes.

Recent updates have enhanced the functionality of the aquarium, allowing fish to grow after eating food and introducing a day-night cycle with a sun and moon graphic. Users can drop food items into the aquarium, and the extension has been optimized to minimize required permissions. With a maximum of 20 fish and 10 food items allowed in the aquarium, Simple Aquarium provides a delightful distraction for users looking to add a touch of aquatic life to their browsing experience.