Quote:Mozilla plans to offer Firefox MSI installers for Windows systems with the release of Firefox 65. MSI installers will be offered alongside regular Firefox installers offered as .exe files for Windows PCs.

MSI installers will be offered for each locale, version of Windows and CPU architecture that is supported, just like it is the case for .exe installers currently.  In other words: Windows 7 or newer, 32-bit or 64-bit, and all locales that Firefox supports.

Firefox Nightly MSI installers are already available; Mozilla plans to publish MSI installers for Beta and Release versions of the Firefox web browser when these versions hit version 65. Firefox Beta 65 will be released in December 2018, Firefox 65 Stable at the end of January 2019.

The Nightly installer is not available on the official download site on the Mozilla website; administrators who would like to download the MSI installer need to open this page on Archive.Mozilla.Org to download the installer to the local system.

Full reading: https://www.ghacks.net/2018/11/29/firefox-65-supports-msi-installers/