I'm much more concerned with the next version of Firefox permanently breaking a lot of important extensions like Pentadactyl and Tree Style Tabs.[1][2][3]

[1] - https://news.ycombinator.com/item?id=10097630

[2] - https://news.ycombinator.com/item?id=9840647

[3] - https://news.ycombinator.com/item?id=10120773