Sorry, we have no current plans to support Firefox on phones with ARM11 (ARMv6) processors, like the Samsung Omnia II. We may revisit this in the future, after Firefox's performance and size have improved on mobile devices.

Sorry, I didn't notice at first that this is a Windows Mobile phone. We have stopped development for Windows Mobile. Old alpha test versions are still available for download if you want to try them out. For details, see: https://wiki.mozilla.org/Mobile/Platforms