aprilFools is a Chrome add-on developed by Romain Sylvian that allows users to play harmless pranks on their co-workers' browsers. With this extension, you can choose from a variety of effects to apply to every website your co-worker visits, making it perfect for an April fool's prank.

The add-on offers a total of 17 effects including upside down, blur, HTML pride, 90's, spin, fade out, and slowly grow text, among others. These effects are inspired by the aprilFools.css library created by wesbos.

aprilFools is easy to install and use. Simply add it to your co-worker's Chrome browser and select the desired effect. The extension runs smoothly and doesn't interfere with the normal functioning of the browser.

If you're looking to add some lighthearted fun to your workplace, aprilFools is a great choice. Just remember to use it responsibly and respect your co-workers' boundaries.