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:
Trjebaće wersiju programa Mozilla, za kotryž přidatk wuwiwaće a tekstowy editor po swojej wólbje. Přidatki dadźa so za nimale kóždy program Mozilla wuwiwać, ale předewšěm za: