Mozilla Firefox 37 latest version offline installer has been release and avail to download. You can download it from here. The version whicw is given here to free download is 37.0.2 at the time of this publication. You are to just click on the given downloading link below to start it's downloading here. the downloading link below which is given here has been brought you from the official site of Firefox. When you will click on the link then its downloading will be start from the official site of Firefox.
To download latest version of Firefox offline installer scroll down to the button of this article and click on given link. After clicking on that link it will provide you the full setup file though a small window where you will be guide to save downloading file. So, click on the save file option and then let the downloading process to further prosessing.
Download Mozilla Firefox 37.0.2 Offline Installer