64-bit architectures are out for quite a long time now and most software applications have made the move already but Web browsers are staying behind.
Within the major competitors, Microsoft is the only vendor I know of providing a stable 64-bit version of Internet Explorer and Edge.
Mozilla, Google and Opera are for now only providing an unstable version of their browser with 64-bit support.
What is the blocking point for Web browsers to switch to 64-bit?