Mozilla officially launched the Firefox 58.0 “Quantum” web browser the other day, on January 23, 2018, bringing numerous improvements and new features like a two-tiered compiler and streaming compilation support to make WebAssembly even faster, WebVR support for Mac OS X users, and support for credit card info in the autofill feature. Firefox 58.0 also improves the Firefox Screenshots functionality by making it run in the Private Browsing mode and allow users to copy and paste screenshots directly to their clipboard, optimizes the loading of web pages by implementing a method to cache JavaScript internal representation, and improved web page rendering speed on Windows systems with Off-Main-Thread Painting.