Puppeteer, a browser automation library, now supports Firefox as of version 23, allowing users to write automation and perform end-to-end testing using Puppeteer and run it against both Chrome and Firefox. This is made possible by WebDriver BiDi, a cross-browser protocol undergoing standardization at the W3C. The support for Firefox in Puppeteer enables features such as capturing log messages, device emulation, network interception, and preload scripts. The announcement highlights the collaboration between the Puppeteer team and the W3C Browser Testing and Tools Working Group.