The new Firefox version is in the process of release soon. Now they are in the act of getting the feedback from the users. They have placed this free trial version in their webpage. So if you wish to download this version then click the below picture

This browser has many new features; some of the features I found while I tried this version are;

Private browsing is the main feature which is included in this version.

When we use this mode and browse the history will not be stored in the web page or any other source.
Includes private browsing, enhanced performance and other new features are present.

When you go to that link and see, we have flexible versions as per the users OS usage it supports are XP, MAC OS, Linux, etc..