Mozilla has introduced the Web Serial API to its Firefox Nightly browser, enabling direct communication with hardware devices like 3D printers and microcontrollers after years of security-related development delays.

Key Points

• The Web Serial API allows browser-based interaction with serial-port devices, including Arduino, ESP32, and ESPHome smart home dashboards.
• Support for the feature appeared in Firefox Nightly 151.0a1 around mid-April, following an initial code commit in January.
• Mozilla previously opposed the API due to security concerns regarding unauthenticated device access, but shifted its stance following internal discussions.
• Google Chrome has supported Web Serial since 2021, with other Chromium-based browsers like Edge, Opera, and Vivaldi following suit.
• Mozilla continues to maintain its opposition to WebUSB and WebHID, citing ongoing privacy and fingerprinting risks.

Why it Matters

Integrating Web Serial support helps Firefox remain competitive with Chromium-based browsers by allowing users to manage hardware directly through the web interface. This shift reflects a broader industry trend where browser developers are balancing strict security protocols against the growing demand for advanced web-based device connectivity.