There used to be a button in the toolbar which let you see the RSS feed for a site, then it got removed but you could add it back through the customization menu. Now I can't seem to even do that.

I guess that Firefox used the RSS button for its live bookmarks feature, and since they removed the live bookmarks they seem to have also removed the button? I only ever used the button to get the feed addresses though, so I could paste them into my RSS reader. So... if I could get the button back it would be great. Otherwise, maybe there's a plugin which does the same thing?