Martin Schirrmacher, a german developer, just released a working port of Fennec (Firefox Mobile). Motorola Milestone and Droid users can click the link below to download it (I am not sure if it is working on other Android devices. It might be compatible with all Android 2.0+ phones.).

Note: It’s a 11 MB file and takes up 41 MB when installed. The UI is working but is very laggy.

Download Fennec (Username: fennec, Password: android)