If you're less technically minded, however, here's a basic description of type inference and why it will speed up Firefox's JavaScript performance by such a large margin. In every programming ...

264 decoder will only perform as expected in recent Firefox nightly builds, which incorporate the latest JavaScript performance improvements—particularly a new type inference mechanism that ...

type inference empowers the compiler to choose the static type of the variable, based on the type of its initializer: Despite the syntactic similarity to a similar feature in JavaScript ...