The team working on the mobile version of Firefox has been primarily focused on developing the browser for Linux and Windows Mobile devices so far. But around 50% of all the Smartphones in the world actually run the Symbian mobile operating system. So it should come as no surprise that Mozilla is also working on a version for Symbian phones.
The plan is to have a working browser by the end of April, 2009 although there’s no official release date for a beta version just yet. Of course, since the browser an open source project, I wouldn’t be surprised if Symbian users were able to download and test early builds as soon as February when the roadmap predicts “basic/limited browsing” fucntionality.