Install a new script, linkfarm, with linux-mozilla. This script makes
symlinks under PREFIX/lib/linux-mozilla/plugins/, pointing to anything the
script finds in the netscape-linux or linux-netscape6 plugin directories. The
script is run automatically on installation of the port or the package and the
user is advised to run it after installing new Netscape plugins. Unlike the
former arrangement, the symlinks are now removed upon de-installation of
linux-mozilla. Increment PORTREVISION.