Pale Moon is coming to ports

[Zhihao Yuan]

A good timing -- when we are about to land FF 57 which
has no more "legacy" extensions.  Please review and give it
a try.  And maybe gecko@ has the experience on how to fix
the test build (roughly same as FF 24).

  https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=223597

Thank you.

-- 
Zhihao Yuan, ID lichray
The best way to predict the future is to invent it.
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