K 10
svn:author
V 6
jbeich
K 8
svn:date
V 27
2020-01-03T23:31:39.166320Z
K 7
svn:log
V 186
MFH: r521966

www/firefox: switch to rc4

Changes:	https://hg.mozilla.org/releases/mozilla-release/pushloghtml?startdate=2019-12-31&enddate=2020-01-04
Approved by:	ports-secteam blanket

END