Cool. I’ve been thinking they should just make that available somewhere for quite a while now, since about:profiles was already pretty usable, it was just impossible to find for normal users. But that they’re improving the user experience at the same time is quite welcome, too.
Yeah, Python requires a “runtime” program, which interprets the Python code and then translates it into native machine code to actually execute it. Because Rust is compiled directly to native machine code by the developer, you don’t need a runtime program on your PC to run Rust programs.
This is also one of the biggest reasons why Rust can be used for kernel development. You cannot rely on a runtime program for developing a kernel, since launching a program requires a kernel to already be up and running.