Looks like gtk2 is only needed for build time, but firefox runs just finely without it.
This is not how we test to see if a lib is still needed. If you do a lddtree of /usr/$(get_libdir)/firefox/gtk2/* you will see you still have a hard dep on gtk2
(In reply to Jory A. Pratt from comment #1) > This is not how we test to see if a lib is still needed. If you do a lddtree > of /usr/$(get_libdir)/firefox/gtk2/* you will see you still have a hard dep > on gtk2 I have INSTALL_MASK="/usr/lib64/firefox/gtk2/", I think this can be resolved with USE flag.