An anonymous reader writes from a report via Ars Technica: For the first time, Firefox has pulled ahead of Microsoft's Internet Explorer and Edge browsers. Mozilla's Firefox grabbed 15.6 percent of worldwide desktop browser usage in April, according to the latest numbers from Web analytics outfit StatCounter. Google Chrome continues to dominate two thirds of the market. StatCounter, which analyzed data from three million websites, found that Firefox's worldwide desktop browser usage last month was 0.1 percent ahead of the combined share of Internet Explorer and Edge at 15.5 percent. Firefox has reportedly been losing market share over the last three months, but Microsoft's Edge and Internet Explorer browsers appear to be declining faster. Last week, Mozilla launched Test Pilot, a program for trying out experimental Firefox features. They've also been fighting the FBI in court for details about a vulnerability in the Tor Browser hack, which may affect the company since the Tor browser is partially based on the Firefox browser code.