The latest (tip-of-tree) protocol changes frequently and may break at any time. However it captures the full capabilities of the Protocol, whereas the stable release is a subset. There is no backwards compatibility support guaranteed for the capabilities it introduces.

Latest browser_protocol.json version updated:

Date: 2026-02-26 05:00:08 +0000

Latest js_protocol.json version updated:

Date: 2025-09-17 04:30:57 +0000