nwww/firefox-esr: update to 60.5.0

Changes: https://www.mozilla.org/firefox/60.5.0/releasenotes/
Patch churn by: https://bugzilla.mozilla.org/show_bug.cgi?id=1513900
Security: b1f7d52f-fc42-48e8-8403-87d4c9d26229
MFH: 2019Q1