Mozilla officially launched Firefox 25 today, with the Android version seeing the most improvements. A very useful guest browsing mode has been added, allowing users to lend out their mobile devices without worrying about the security of their personal information. In addition, there's a mixed content blocking mode that effectively prevents some attacks and eavesdropping that occur on HTTP pages. For desktop users, this update includes fewer changes, but it’s worth mentioning that the new version will support more audio effects through Web Audio. Relevant links have been provided in the reference sources for those who need to update.
What’s New NEW
Web Audio support NEW
The find bar is no longer shared between tabs CHANGED
If you’ve been away from Firefox for months, you will now be offered the option to reset it to its default state while preserving your essential information CHANGED
Resetting Firefox no longer clears your browsing session DEVELOPER
CSS3 background-attachment:local support to control background scrolling DEVELOPER
Many new ES6 functions implemented HTML5
Iframe document content can now be specified inline FIXED
Blank or missing page thumbnails when opening a new tab FIXED
Security fixes can be found here
Download link for all new versions: http://www.mozilla.org/en-US/firefox/all/