Created attachment 164879 [details] Patch with port updates. Proposed patch updates firefox port to using new options framework.
A commit references this bug: Author: jbeich Date: Wed Mar 2 22:49:49 UTC 2016 New revision: 409979 URL: https://svnweb.freebsd.org/changeset/ports/409979 Log: gecko: unify unchanging options into bsd.gecko.mk PR: 205741 (alternative) Changes: head/Mk/bsd.gecko.mk head/mail/thunderbird/Makefile head/www/firefox/Makefile head/www/firefox-esr/Makefile head/www/libxul/Makefile head/www/seamonkey/Makefile
This was fixed long ago