I do not like the fact that I can no longer type a word in the Address Bar and go to a website because they changed it to a Search Engine term.
For example, I would be able to type "sportsillustrated" and FF would go automatically to sportsillustrated.cnn.com. Now it goes to a Wikipedia entry. Not good.
I also had to get a new add-on to fix the glitch (they call it a "feature") that at least one tab shows at all times. That's a fail.
From what I understand, future FF changes, maybe in FF24, will force a Chrome-like GUI appearance called Australis. That, too, is a fail.
It would appear to me that FF22 was the last, best version of the browser. I have therefore disabled auto updates.