The Firefox Profiler was born as the Gecko Profiler, the internal tool that Firefox developers use to analyze and improve the performance of the Firefox browser.

Earlier this year, we replaced the Firefox Devtools' performance panel with this powerful tool, because we thought that Web Developers should also have access to the same data. While this newer tool provides a lot more information than what was previously available, it's also more complicated as a result. In this talk I'll explain and show the basics, so that you'll then be able to use the tool for your own profit.