Firefox 37 is due out on March 31st, but is available to download now.
http://www.neowin.net/news/firefox-370-released-now-available-for-download
WARNING
If you use Norton Identity Safe / Toolbar DO NOT install this version of Firefox until after the Toolbar Patch is released and you have received it by Live Update for your Norton security product. Please keep an eye out for an announcement here - https://community.norton.com/en/blogs/product-update-announcements
Cheers.