LINK / CITE ADD TO WORD LIST. adjective. The definition of precious is something of great value or that is greatly loved. 1  An example of precious is priceless jewelry.
However, we can always point to the latest version under a particular category. The Current supported official version, which is the generally distributed and widely available latest version of Firefox, is Firefox 38.0.5. This version had an official release on June 2nd, 2015.
Firefox redesigned for touch and Windows 8. Firefox Nightly is the current testing version of Firefox. At the moment, it's being optimized for Windows 8's metro design, and with every day that passes, Firefox Nightly is improved upon and refined. It's worth bearing in mind, however, that as Firefox Nightly is a testing build, it's not stable.