Firefox 8 isn't different from Firefox 7. Here are the most important changes:

1. Twitter Integrasi
    Mozilla updated its search toolbar to extend support to
    Twitter searches
2. Graphics Improvement
    Besides the features users can see, under the hood 
    Mozilla has added support for WebGL, a technology that 
    leverages the computing hardware to accelerate graphics
    within the browser
3. Third-Party Clean-Up
    In Firefox 8, Mozilla has enhanced security and privacy by disabling third-party applications and 
    add-ons that automatically install themselves
4. Master Password for Android
    Android users now have the option to enable the Firefox Master Password, which protects
    every saved username and password
5. Developer Options
    Mozilla declares itself "a leader" in HTML5, and in Firefox 8, Web developers can customize
    the options users have in the right click menu, saving them from having to build their own menu. 
    source : ibtimes.com

Ok, Please download the Link below

Firefox 8