New Firefox

It is worst of all. Just starting it, without opening any pages, already takes 600 Mb. It constantly accesses HDD and stops the world of garbage collection or page unloading or something. How can something be that bad?

Firefox 57 actually crashes Windows 10. I waited 10 minutes, and mouse cursor still wasn't moving, just constant HDD access. If system doesn't answer for 10 minutes, then it is as good as crashed.