This is only my own opinion, but something that usually gets my goat when I'm browsing is when I come across a site that links random phrases to stuff. That being said, it's no secret that I had left the discovery widget disabled in Yoono.
So, I upgrade to 6.0.0 today and find that the discovery widget enabled itself during the upgrade. I go in, disable the widget, restart Firefox for good measure, and... the discovery links are still there.
This screencap tells all: