This is the big endian version of the ICU data file that Firefox52 needs
on big-endian machines.

Unzip and put it into /usr/pkg/lib/firefox52, like:

-rw-r--r--  1 root  wheel  26213232 Oct  6 13:20 /usr/pkg/lib/firefox52/icudt58b.dat


Checksum:

SHA256 (/usr/pkg/lib/firefox52/icudt58b.dat) = b8d76abcaef3dd85803a36019999f70509554c43231190dd3a97c9e4b7085f05