Windows XP and its derivatives (Windows Server 2003, Windows XP Tablet Edition, Windows XP Media Center, Windows Embedded Standard, Windows Embedded for Point of Sale, Windows Fundamentals for Legacy PCs, Windows Embedded POSReady 2009) are still widely used all over the world by corporations, offices, restaurants (tills), ATMs, transport services, elevators and even gas stations.

According to net market share data released on September, computers running Windows XP still represent the 3.19% of the total internet population, making it the fourth most used Operative System, with 50 million users.

This petition asks Mozilla developers to support Firefox ESR for Windows XP and its derivatives via security patches.