The Baseline Interpreter: a faster JavaScript interpreter in Mozilla Firefox 70

Modern web applications load and execute a lot more JavaScript code than they did just a few years ago. While JIT (just-in-time) compilers have been very successful in making JavaScript performant, we needed a better solution to deal with these new workloads.

Source: The Baseline Interpreter: a faster JS interpreter in Firefox 70 – Mozilla Hacks – the Web developer blog