Web-Perf Wednesday 006 – Faster Browser Releases Change Your RUM Population – CSS Wizardry

kept by eddie sep 02

Chrome and Firefox shifting to fortnightly release cycles means RUM cohorts become smaller and faster-changing, requiring release-aware analysis and annotations to avoid misinterpreting performance shifts.

What's new in web extensions: I/O 2026 recap | Blog
Google announced AI-driven developer growth, MWG skill, DevTools for agents, granular roles, enterprise publishing, and browser namespace support for Chrome extensions at I/O 2026.
also on Chrome DevTools, Chrome, #browser-engineering, #developer-tools
Chrome DevTools MCP (2025)
Chrome DevTools MCP now allows coding agents to connect to active browser sessions, enabling direct access to authenticated sessions and active debugging for AI-assisted workflows.
also on Chrome DevTools, #browser-engineering, #developer-tools
Google Chrome update will fully close the door on ad blockers
Google Chrome is fully removing Manifest V2 support in upcoming releases, finally ending the last loophole that allowed ad blockers like uBlock Origin to work.
also on Firefox, Chrome, #browser-engineering
Guillaume Técher
Chrome uses JPEG partial IDCT scaling to decode only low-frequency data when rendering images at small scales, causing icons to render thicker due to lost edge detail, a behavior not shared by Firefox.
also on Firefox, Chrome, #web-development, #developer-tools
Dictionary Compression is finally here, and it's ridiculously good
Dictionary compression using Zstandard or Brotli can reduce web traffic by up to 90% for returning users by leveraging previously downloaded content as a shared dictionary.
also on Chrome, #browser-engineering, #web-development, #software-engineering, #developer-tools