A melhor maneira de fazer isso com todas as personalizações é com esta ferramenta útil dedicado apenas para a criação de um instalador silencioso sem interrupções para o Firefox 18.
It can be frustrating to manually reinstall Firefox with all its extensions, themes, personas and other add-ons. Even for those administrators who need to deploy Firefox on hundreds of network computers will find it a cumbersome task to do it manually. To assist you in building a silent Firefox installer with all of the settings preset, here is Firefox Addon Maker.