WebMCP in 2026: Which Browsers Support navigator.modelContext? (Complete Compatibility Status)

Chrome 146 Canary shipped navigator.modelContext last week. That makes Chrome the first browser with native WebMCP support - giving AI agents structured access to web page content without scraping, without Puppeteer, without fragile CSS selectors. But Chrome isn't the whole web. If you're building a WebMCP-compatible site today, you need to know where every browser stands. Here's the complete picture as of March 2026. Browser Compatibility Table Browser WebMCP Status navigator.modelContext Version Notes Chrome Supported Yes 146 Canary First implementation. Behind flag in stable. Firefox In Progress No - Mozilla is in the W3C WebMCP working group. No public timeline. Safari In Progress No - Apple joined the W3C working group. WebKit tracking bug filed. Edge In Progress No - Microsoft participating in W3C spec. Likely ships shortly after Chrome stable (shared Chromium base). Brave Not Started No - No public commitment. Chromium-based, so could adopt Chrome's implementation. Arc Not Start