Mozilla Firefox is a free and open-source privacy focused web browser for Windows, Linux, macOS, Android and iOS 13. It comes with ad tracking blocking, auto-play blocking, screenshot tool, Text to speech and more. If you download Mozilla Firefox from the official Mozilla website, then you will get online installer only. When you run this Online web installer file, it will download and install the complete Firefox browser from the internet. You need active internet connection during the installation.
Now you can also download latest version of Firefox browser in Standalone Offline installer form. Using this type of installer you can install in your system without any internet connection. To download Firefox Standalone Offline installer, go to this link and select the browser type, OS and language. Now click on the download button to download the latest offline installer.
For Mozilla Firefox ESR, Beta, Nightly and Developer Edition, use below link,
Or download the latest full version of the web browser from the official Firefox ftp server. Just select the version number directory and downloads based on your system.
You can also use the below link.