[gentoo-user] Trouble decrypting message from firefox ebuild

[Grant Edwards]

I just build firefox and noticed the following warning in the
ebuild output, and I'm a bit baffled by the grammar:

     All the packages built against mozilla-firefox won't
     compile, if after installing firefox 3.0 you get some
     blockers, please add 'xulrunner' to your USE-flags. 

Does anybody have idea what the above sentence is trying to say?
  
-- 
Grant