Firefox supports WebExtension APIs, which in most cases are compatible with the extension APIs supported by Google, Chrome and Opera, so your extensions will run in Firefox with just a few changes.
Firefox podpěruje API WebExtension, kotrež su zwjetša z API rozšěrjenjow kompatibelne, kotrež so přez Google, Chrome a Opera podpěruja, tak zo budu waše rozšěrjenja z jenož mało změnami w Firefox fungować.