# Mango I declare war to rouded corners! Firefox Addon Store Icon ## Example Mango VS YouTube default design ## How it works ```css * { border-radius: 0 !important; } ``` This CSS tells your browser that everything (`*`) should have the property `border-radius` (amount of rounded corner) to 0. The extension just injects this into your page after checking if the page is whitelisted. This extension is so tiny that you can review `mango.js` and `main.js` by yourself or with help of AI. ## Why Mango Mango is the codename of _Windows Phone 7.5_, the first version to adopt Microslop's "Metro UI". I grew up as a kid using Windows Phone and that shaped the way I see rounded corners—and I absolutely hate them.