Mozilla had released FireFox 4 for PC, Mac and Linux last week. They have also announced a FireFox Mobile (Release Candidate) for Maemo and Android devices.
httpv://www.youtube.com/watch?v=i8c6PbL2SQQ
This release comes with many changes such as
- Faster scrolling
- Firefox Sync
- Full Screen Browsing
- Tabbed browsing
- Firefox Add-ons
The update is available via Android Market for Android devices. And N900 users can download this update from Mozilla Mobile