Embark on a guided tour with SpiderMonkey engineer Yulia Startsev in this 59-minute video from Mozilla Hacks. Gain insight into the daily work of a JavaScript engineer on the SpiderMonkey compiler, focusing on improving conformance with ECMA-262, the JavaScript Specification. Follow along as Yulia demonstrates the process of fixing a bug, offering a real-world example of compiler maintenance and optimization. Originally streamed live on Twitch, this recording provides a unique opportunity to observe the intricacies of compiler development and the meticulous work involved in enhancing JavaScript engine performance.