Mozilla provides several official ways to access full standalone installers for Windows (32-bit and 64-bit), macOS, and Linux: Choose which Firefox Browser to download in your language
(also known as offline installers) are the full setup files for the Mozilla Firefox browser , containing every component needed for installation in a single package. Unlike the standard "stub" or web installer—which is a small file that downloads the rest of the browser during the installation process—a standalone installer works without an active internet connection after the initial download. Where to Download Official Firefox Standalone Installers
