I'm trying to associate a specific action with a file type in Firefox 3.0.
When I go to Edit > Preferences > Applications, there is no way to add a file type, such as MP3. I can edit existing file types and their behaviours, but I can't add any new ones.
There are instructions that say to click Edit > Preferences > Content > File Types > Advanced button, but I think that's for a different version of Firefox, because it's not actually there in 3.0.
Is there a way to do this on the fly, when I click a link? Is there a clever extension that makes this relatively simple thing finally easy to do?