I set the plugin path of namoroka to this order, uploading now:
~/.mozilla/plugins:${MRE_HOME}/plugins:/usr/local/lib
Plugins in your home directory will take precedent over those installed in /usr/local/namoroka/firefox-$(version)/plugins, and those take precedent over /usr/local/lib/mozilla plugins.
I will do the same for the other firefox's so /usr/local/lib/mozilla/plugins is a universal plugin directory, but at the same time that universal plugin directory will not override those either in the home directory or in the extension specific plugins directory.
9pm: firefox.tcz, seamonkey.tcz, and icecat.tcz also fixed to add /usr/local/lib/mozilla/plugins to plugin path.