According to the latest meeting notes from the Mozilla development team working on Fennec, also known as Firefox Mobile, the mobile browser could make its official debut on a Windows Mobile device as early as next week. To date, we have only seen screenshots of Fennec on a Windows Mobile device. That is about to change. According to the latest Windows Mobile status report,
We are targeting a Milestone release for the first week of February, targeting the HTC touch pro.
To date, Fennec has only been available for the Nokia N810 Internet Tablet although there are also versions for desktop PCs.
Source: WMExperts.com