VRML 2 export not visible I am using Blender 2.7.8 on MacOS 10.12.3.

According to the wiki blender can export VRML2. And that's what I want to do.

I created an empty Blender file, imported an STL, applied a material and searched for the VRML2 entry in the "File -> Export" menu:


As you can see it's not there. But the (as far as I understand) responsible scripts are existing (location: /Applications/blender.app/Contents/Resources/2.78/scripts/addons/io_scene_vrml2).

Can you please tell me why the export vrml option is missing?
Go in user preference and under add-on tab search and activate the  add-on VRML2Export