That's a common mistake, but JITs in WebKit and Gecko came out at around the same time as v8. Their development began before v8 launched. edit: For example, se

That's a common mistake, but JITs in WebKit and Gecko came out at around the same time as v8. Their development began before v8 launched. edit: For example, see the dates on Wikipedia, v8 launched September 2008, and WebKit's Nitro (SFX) JIT launched in the same month. https://en.wikipedia.org/wiki/WebKit#JavaScriptCore https://en.wikipedia.org/wiki/WebKit#JavaScriptCore https://en.wikipedia.org/wiki/V8_(JavaScript_engine) https://en.wikipedia.org/wiki/V8_(JavaScript_engine)