Just found this out via WMExperts.com that Mozilla Foundation has released a new version of Firefox, codenamed Fennec for all Windows Phones running 
Windows Mobile 6.0 or later. The main focus of Fennec is to bring decent desktop browser like functionality to Windows Mobile devices which are currently lacking a browser like Safari is for iPhone.
This new alpha release brings more stability, performance, and better integration with Windows Mobile OS. It also includes numerous fixes and better performance among other things. Full change log is as follows:
What’s New in Fennec Alpha 3:
New for Alpha 3:
- Much improved panning/scrolling performance
- Improved start-up time
- Revised theme
- Support for running in full screen
- Numerous bug fixes
- Improved painting performance
- Improved UI polish
- Support for touch sensitive directional pad on HTC devices
- Improved kinetic panning with directional locking
- Ability to scroll frames
- Improved zooming support
- Support for multiple screen sizes
This builds upon the feature set of the previous releases:
Easy navigation to Web content:
- Bookmarks, including tags
- Smart URL bar ("awesome bar")
- Tabbed browsing with thumbnail images
- Integrated Web search – built into the URL bar
- Easy access to multiple search engines
- Built in error console
- Support for add-ons
Web content:
- Maximize content by auto-hiding controls and URL bar
- Zoom in and out
Security:
- Instant Web site ID ("Larry")
- Password manager
- Popup blocker
- Clear private data
Devices services integration:
- Click on a phone number to initiate a call
- JavaScript API to get device location
Also:
- Searchable download manager
- Preferences pane
- Add-ons manager, including ability to directly find and install add-ons
Apart from Fennec release for Windows Mobile devices, Mozilla has also shipped emulators of Fennec which you can run on Windows, Mac OS X and Linux to try out how the browser is going to work before installing it on your mobile.
Screenshots below are from Fennec Emulator running on Windows 7:
Download Fennec for Windows Mobile
Download Fennec Emulator for Windows, Mac OS X and Linux
