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As said in the other thread, you can change it back by going to about:confing and changing browser.urlbar.trimURLs to false.

It is not in the url bar but you can right click on the toolbar select customize and then drag a rss button back onto the toolbar.

That's weird -- the icon is still there, but not default, and it just takes about two clicks to restore it.

So what's the purpose of the addon?

You mean the icon in customize? You cannot put that one inside the urlbar.

Aha, all is now clear. (I really liked the idea of the RSS button when they added it, but never actually ended up using it...)