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Note: Mozilla changed the design of download pages recently. So, if you always wanted to check out Firefox 0.10, Firefox 4.0, or Firefox 25.0, now is your chance to do so (if you do, please do so in a locked down environment as these browsers may contain security vulnerabilities that were fixed in later versions). The core difference between the two options is that you can download any version of Firefox from the FTP server but only the latest version from the website.
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Both let you download a full copy of Firefox for all supported operating systems, architectures, and languages. You can download offline versions of Firefox from the Mozilla website or from the archive server. You have two official options to download offline versions of the Firefox web browser to your system.
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With the web installer, you would have to download the browser multiple times (for each system once) which may waste a lot of bandwidth and time. You can use full Firefox downloads to install Firefox on systems without Internet connection, or for distribution purposes if you want to install it on multiple systems. While users want the latest version usually, older versions may sometimes be required, for instance when the latest version causes issues on a system. The main downside is that setup requires an active Internet connection, and that the latest version of Firefox is downloaded and installed. In other words, users will get the latest version of Firefox when they run the installer and they may re-use it. Unlike the offline installer, which always installs the version of Firefox that you downloaded, stub installers query Mozilla during installation so that the latest version of Firefox is downloaded and installed.
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The stub installer has advantages and disadvantages over full or offline Firefox installers.
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