Mozilla and Samsung are working on a new Web browser engine based on Rust.
Mozilla, Samsung Collaborating on New Browser Engine : Read more
Mozilla, Samsung Collaborating on New Browser Engine : Read more
so is a gun, until you put a finger on the trigger. The only ways this could be "safe by default" is by obscurity (probably) or by creating a randomly generated hypervisor and running the browser within a shelled off mini OS (very unlikely.)it is *safe by default*