You will need to have a version of the Mozilla software that you're building the add-on for and a code editor of your choice. Add-ons can be built for almost all Mozilla software but are primarily targeted for:
Trjebaśo wersiju programa Mozilla, za kótaryž wuwijaśo dodank a tekstowy editor pó swójom žycenju. Dodanki daju se za skóro kuždy program Mozilla wuwijaś, ale pśedewšym za: