As stated in GLEP 42 (http://www.gentoo.org/proj/en/glep/glep-0042.html) the repository name should only contain a-zA-Z_\-\+ (see http://www.gentoo.org/proj/en/glep/glep-0042.html#required-portage-enhancements). Currently profile/repo_name contains "Mozilla Project Overlay", this should be changed to be "mozilla" for example. Reproducible: Always
Fixed, thanks