Revision 469334

MFH: r468751 r468754 r468985 r469332

www/firefox: update to 60.0

- Add U2F support, required by Web Authentication [1]
- Drop libv4l support to reduce maintenance

Changes:	https://www.mozilla.org/firefox/60.0/releasenotes/
PR:		226476
Tested by:	tobik, jrm, D. Ebdrup, lwhsu
Submitted by:	Greg V [1]
Security:	5aefc41e-d304-4ec8-8c82-824f84f08244
Approved by:	ports-secteam blanket
Differential Revision:	https://reviews.freebsd.org/D15186