The www/nvu port does not enable the editor/cascades extension. The reason for this is because the configuration script contains a line which initially enables the extension but then a line later in the file disables it.

Fix: 

Please take note that the mozilla build system is complex and I certainly am no expert. I have verified that this patch at least configures nvu to build with cascades. I'm not sure if this is the right fix to the problem. The configuration script setup process for the port appears to be borked. The problem appears to be that the port specifies a mozconfig script:

     PORT_MOZCONFIG= ${WRKSRC}/composer/config/mozconfig.linux

but the Build process ignores it choosing to use:

     ${WRKSRC}/.mozconfig instead--j5iyc3Q1AVwHvK7QAF2uPVJpFOzCzaeJKwZVTsfDobgQSyaz
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--- work/mozilla/.mozconfig.orig        Fri Sep 29 12:41:03 2006
+++ work/mozilla/.mozconfig     Fri Sep 29 12:47:47 2006
@@ -92,7 +92,7 @@
 ac_add_options --with-pthreads
 ac_add_options --x-includes=/usr/X11R6/include
 ac_add_options --x-libraries=/usr/X11R6/lib
-ac_add_options --enable-extensions=default
+# ac_add_options --enable-extensions=default
 ac_add_options --enable-image-decoders=default
 ac_add_options --enable-necko-protocols=default
 ac_add_options --with-system-jpeg=/usr/local
How-To-Repeat: Build the www/nvu port. Start the application. Pullup the "Tools" menu. Note the lack of an entry for the CSS Editor which is documented at the nvu project site.