Free download mozilla firefox 8.0 direct link from official website link. Mozilla released Firefox 8.0, about 7 months after it released Firefox 4.0. And they look similar, except that the new one looks more polished. Granted, drastic UI changes can hit users' learning curve and preferences. The new UI sports essentially the same layout as its predecessors since version 4.0, but the elements look designed better, fused into the theme. It's the under-the-hood changes that are counting. Mozilla would never pack so many background changes to the monthly updates of Firefox 3. 
Mozilla Firefox 8.0 New Features:
- Add-ons installed by third party programs are now disabled by default
- Added a one-time add-on selection dialog to manage previously installed add-ons
- Added Twitter to the search bar for select locales. Additional locale support will be added in the future
- Added a preference to load tabs on demand, improving start-up time when windows are restored
- Improved performance and memory handling when using
- Added CORS support for cross-domain textures in WebGL
- Added support for HTML5 context menus
- Added support for insertAdjacentHTML
- Improved CSS hyphen support for many languages
- Improved WebSocket support
- Fixed several stability issues
- Fixed several security issues