Web Serial in Firefox 151 helps makers connect, code and control Adafruit hardware projects directly in the browser.

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Mozilla

Firefox 151 introduces support for the Web Serial API on desktop, enabling browser-based communication with microcontrollers and serial-connected hardware devices without additional software. Mozilla partnered with Adafruit to test and validate these workflows, meaning Adafruit's browser-based hardware tools like the WebSerial ESPTool now work directly in Firefox. This is particularly relevant for makers, educators, and embedded-device communities using CircuitPython and similar tools.

Mozilla and Adafruit bring Web Serial workflows to Firefox