[Curiosity]

With Firefox 3.6.*, Ogg Vorbis files are being handled only by plugins. Why??
Using Mac Firefox, I set 'browser.download.pluginOverrideTypes', as well as 'plugin.disable_full_page_plugin_for_types' to include application/ogg. I also changed the setting for Ogg files in Preferences > Applications to 'ask first', after adding both VLC and MPlayer to the application list. All that was ignored and Firefox insists on using a plugin. I tried setting the Ogg files setting to open with VLC, and then MPlayer. That was ignored. I tried setting it to save the file. That too is ignored. If I set 'media.ogg.enabled' to false, Firefox tries to use the Quicktime plugin, which does not handle .ogg files. I looked in the mimeTypes.rdf file, and that shows the settings exactly as I set them up in Applications.
Windows Firefox does not list Ogg in the Applications list at all, though I have Irfanview set up to play Ogg Vorbis files. I have the same plugin override & disable settings as for Mac. If I set 'media.ogg.enabled' to false, the VLC plugin plays the file.
What is going on with Firefox? How was the use of helper applications completely disabled for that content-type? Is there any way to reverse that?
I have been told that Firefox now handles ogg files itself without needing a plugin, but if I disable that handling, why is it insisting on a plugin?