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.
Mozilla Firefox 51 is the latest stable version of the browser. The new version replaces previous stable versions, including Firefox 50.1, the last version Mozilla released prior to the Firefox 51 release. All Firefox channels follow the same release schedule.