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Mozilla Automation TeamKatherine Patenio9 min readintermediate

High-speed Release Trains – These Weeks in Firefox: Issue 209

Read on mozilla.org

Summary

Firefox 155 shipped via a new 2‑week release train; the week’s highlights include a WebExtensions theme API addition, multi‑context address bar in Nightly, DevTools stylesheet editing in the JS debugger, and extensive New Tab page UI/telemetry work (stocks widget, privacy widget, policy‑locked settings). The post also calls out many volunteer contributors and a handful of infrastructure tweaks (T…

  • Firefox now runs on a 2‑week release cycle – Firefox 155 is the first full‑cycle ship.
  • WebExtensions gain a `backgrounds_area` theme property to control image placement (targeting Firefox 156).
  • Nightly enables a multi‑context address bar for the New Tab page, pending bug fixes before Q4 rollout.
  • DevTools can now edit CSS stylesheets directly from the JavaScript Debugger pane (experimental flag).

The shift to a 2‑week release cadence shortens feedback loops for both developers and users, making Firefox more responsive to security and feature updates. The highlighted UI and tooling changes improve developer ergonomics (DevTools stylesheet editing) and end‑user experience (customizable New Ta…

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