firefox: pkg: Cannot solve problem using SAT solver

[Anton Shterenlikht]

I'm in a jail under amd64 9.2-RELEASE.

# pkg info -xo pkg-
pkg-1.3.7                      ports-mgmt/pkg

# pkg check -srda
Checking all packages: 100%
#

# pkg install firefox
Updating FreeBSD repository catalogue...
FreeBSD repository is up-to-date.
All repositories are up-to-date.
Checking integrity... done (1 conflicting)
pkg: Cannot solve problem using SAT solver:
cannot install package firefox~www/firefox, remove it from request? [Y/n]: y
Checking integrity... done (0 conflicting)
The most recent version of packages are already installed
#

Have I forgotten something?

Thanks

Anton