With latest release of Selenium RC(1.0 beta 2) there

are two modes for IE *iexplore(same as *iehta) and *iexploreproxy.

Similarly for Firefox use *firefox(same as *chrome) and *firefoxproxy.

You should prefere *iexplore(ie *iehta) and *firefox (ie *chrome)

respectively as they work with cross domain.