Modern web browsers are ubiquitously used by billions of users, connecting them to the world wide web.From the other side, web browsers do not only provide a unified interface for businesses to reach customers, but they also provide a unified interface for malicious actors to reach users.The highly optimized scripting language JavaScript plays an important role in the modern web, as well as for browser-based attacks.These attacks include microarchitectural attacks, which exploit the design of the underlying hardwa…