Another feature, that no one asked for, that breaks stuff. Every site that mozilla breaks is one more nail in its coffin. Speed is your second requirement, then security, then privacy: the first requirement is alway that the bludy websites work. When mozilla lost track of this and prioritiezed security then privacy then performance, and finally/ maybe letting you get your job done, their market share started to fall. The world needs an alternative to google's vertical. One that actually works.