Mon Nov 18 2019 21:35:51 UTC
That doesn’t happen on my machine.
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ID Product Component Assignee Status Resolution Summary Changed
226132 Ports & Packages Individual Port(s) gecko New --- www/firefox-esr can not be installed if www/firefox already is 2018-06-30
232759 Ports & Packages Individual Port(s) gecko New --- www/firefox-esr-i18n packaging legacy plugin and ignores language options 2018-10-28
2 bugs found.

as

File a new bug in the "Individual Port(s)" component of the "Ports & Packages" product