diff -up firefox-68.0/build/autoconf/icu.m4.icu firefox-68.0/build/autoconf/icu.m4

--- firefox-68.0/build/autoconf/icu.m4.icu	2019-06-25 21:25:25.394425654 +0200

+++ firefox-68.0/build/autoconf/icu.m4	2019-06-25 21:26:23.544210474 +0200

@@ -78,7 +78,7 @@ if test -n "$USE_ICU"; then

     # TODO: the l is actually endian-dependent

     # We could make this set as 'l' or 'b' for little or big, respectively,

     # but we'd need to check in a big-endian version of the file.

-    ICU_DATA_FILE="icudt${version}l.dat"

+    ICU_DATA_FILE="icudt${version}b.dat"

 fi

 AC_SUBST(MOZ_ICU_VERSION)