mozilla-firefox and firefox packages

["[KS]" <lists04@fastmail.fm>]

I have noticed that since about a week or so ago that there is another
package for firefox browser namely "firefox" (version 1.4.99+1.5rc3)!
The rc version had been in experimental earlier and now this package can
be found in unstable.

I don't know if I have missed an annoucement (gladium ??) about the
package name change or something similar but I'm confused as to why the
change is there. Both 1.0.7 and 1.4.99+1.5rc3 are presently in unstable
and firefox conflicts mozilla-firefox.

Any light on this confusion will be appreciated.
Regards,
/ks