Firefox 4.0.1 is out :) Please update your ebuild of firefox-bin to latest version 4.0.1. I have been create ebuild for new version, enjoy =] Reproducible: Always
Created attachment 272183 [details] firefox-bin-4.0.1.ebuild
Created attachment 272185 [details] Manifest file for firefox-bin-4.0.1.ebuild
Thanks for the report, fixed in CVS