"Begin disabling installed extensions still using Manifest V2 in Chrome stable"

I wish some brave enough (no relation to Brave) soul patched Blink so it became possible to delegate URL blocking decisions to an external process via some sort of IPC. In goes a full URL and maybe an opaque session ID so some state may be tracked, out goes a boolean value. Assume all are allowed if this process cannot be connected to.

You can already do this with a MITM proxy, and it works in all browsers.