proomt

Search

Search posts, papers, and topics

All posts

Mozilla Automation TeamMike Conley7 min readintermediate

Motion, Colour, Captions, Kit – These Weeks in Firefox: Issue 207

Read on mozilla.org

Summary

Weekly Firefox automation update covering new @media emulation UI, theme picker tweaks, Picture‑in‑Picture caption support, several WebExtension bug fixes (frameId attribution, startup race), DevTools enhancements (JSONL viewer, screenshot speed‑up, ::checkmark pseudo‑element), and assorted tooling clean‑ups.

  • DevTools now shows JSON Lines files with proper error highlighting.
  • New panel in DevTools Rules lets you emulate CSS media features like prefers‑reduced‑motion.
  • New Tab customization adds pastel theme swatches and a “See more themes” link.
  • WebExtension framework fixes a startup race that could drop dynamic content scripts.

These incremental improvements directly affect day‑to‑day developer experience when debugging web apps in Firefox, especially for accessibility (reduced‑motion, captions) and for extension authors dealing with content‑script timing and network‑request tracking.

5/10
automationtestingfirefoxdevtoolswebextensions

Related reading

  1. Icons! Lots of them! – These Weeks in Firefox: Issue 206

    Firefox 154 adds a Windows‑only UI to change the default browser icon, exposes a new Picture‑in‑Picture WebAPI, and ships a raft of small but concrete improvements across Add‑ons, DevTools, WebExtensions, WebDriver and the Rust‑based login storage component. Most changes are toggles or bug‑fixes (e.g., CSS handling in the Debugger, startup‑performance regression fix, storage.local auto‑reset, and…

    Mozilla Automation Teammozilla.org13 min

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

    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…

    Mozilla Automation Teammozilla.org9 min

  4. Firefox WebDriver Newsletter 155

    Firefox 155 WebDriver newsletter lists recent bug fixes and cleanup work, including fixing a DevTools conflict, removing a thin helper, correcting double‑click behavior, and simplifying subscription handling.

    Mozilla Automation Teamfxdx.dev1 min

  5. Firefox DevTools MCP 0.10.3 released

    Firefox DevTools MCP 0.10.3 is released, introducing a new `close_firefox_session` tool, full-page screenshot capability, and configurable download folders. This update also includes bug fixes and clarifies the usage of `restart_firefox` for controlling Firefox via WebDriver BiDi.

    Mozilla Automation Teammozilla.org1 minrelease