This document provides an introduction to localization (L10N) at Mozilla. It defines localization as the process of translating software into another language, including text translation as well as date, number, and currency formatting. It encourages downloading the Sinhala version of Firefox and meeting the Sinhala localization team. It outlines tasks for getting started with localization by contacting the L10N team, downloading and testing localized software, signing up on the translation platform Pontoon, and reporting any translation bugs found.