This Week in Extensibility: the Chrome Web Store bans two extension categories, Mozilla proposes a permission model for AI agents, Cloudflare runs customer code before signup

Week of July 10–17, 2026: the Chrome Web Store bans prediction-market and AI-guardrail-circumvention extensions and narrows what any extension may collect, Mozilla proposes a browser-mediated permission model for AI agents at the WebExtensions group, and Cloudflare ships a way to run a customer's code before they sign up.