This Week in Extensibility: Edge commits to removing Manifest V2, WebMCP adds Edge and Brave, Cloudflare previews a code-sandbox SDK

Week of August 7–14, 2026: Microsoft Edge commits to removing Manifest V2, WebMCP origin trials reach Microsoft Edge and Brave, and Cloudflare ships a 1.0 preview of the SDK for running customer and agent code in isolated sandboxes.