Dev Stack
Firefox 157 ships a redesign and hardware AV1 for WebRTC
Firefox 157, out September 29, 2026, adds hardware AV1 decoding for WebRTC calls, a CSS at-rule() test and Mozilla's biggest visual refresh in years.
Browsers news and analysis
Browser news: Chrome and Edge release cycles, the end of Manifest V2 extensions, View Transitions and other web APIs landing in React, agent-first browsers for automation, and WebAssembly running a Linux kernel in a tab. Each story says what changes for extensions, sites and tests.
AI & LLMs
BragJack: one extension can hijack browser AI agents
BragJack lets one malicious extension take over the AI assistants in Chrome, Edge, Comet, Opera Neon and Claude in Chrome. Two CVEs, over $20,000 in bounties.
Tech Industry
Firefox Smart Window beta now runs on Mistral Small 4
Mozilla says Mistral Small 4 powers the Smart Window beta in the US, Canada and France, and that users can still pick a different model.
Dev Stack
JPEG XL critique says AVIF now beats it on compression
A new benchmark puts AVIF ahead of JPEG XL across the fidelity range, and clocks a 1,918-byte JPEG XL file at 17.43 seconds to decode.
Coding
React 19.3 ships View Transitions and Fragment Refs
React 19.3 shipped on September 9, 2026. View Transitions and Fragment Refs are now stable, and the release carries no breaking changes.
Dev Stack
Chrome moves to a two-week release cadence
Chrome 153 starts a two-week milestone cycle, down from four. Google says Chrome 149 and 150 alone fixed 1,072 security bugs as LLMs find flaws at scale.
Dev Stack
TryNix runs any Nix package in a browser tab
TryNix boots a Linux kernel compiled to WebAssembly and runs any of 310,083 nixpkgs versions in a tab. Python 3 takes 7.5 seconds on a first visit.
Tech Industry
Google pulls every Manifest V2 extension from the Chrome Web Store
The last Manifest V2 extensions, classic uBlock Origin among them, are gone from the Chrome Web Store. Copies already installed keep running, but they get no updates.
Dev Stack
Cloudflare's Kitesurf is a browser built for AI agents, not people
Cloudflare built Kitesurf, an agent-first browser that runs in V8 isolates on Workers - 3-7x lighter than Chromium on CPU and memory, free in beta, Playwright-compatible.
Tech Industry
Edge begins dropping Manifest V2, leaving uBlock Origin to Firefox
Microsoft Edge has begun phasing out Manifest V2 extensions, cutting off classic uBlock Origin and leaving Firefox as the last major browser still running it.
The daily brief
Three to five stories a day, and what each one means for the people who build software. Free, no spam.