I really like the idea and it made me realize that I want a simple interface to list/switch/create tabs from custom tools.

However, I think a less powerful extension that just subscribes to `chrome.(tab|window).*` events and reports them to a local server and listens for commands (e.g to create tabs) would be enough. Not using the debug api and not exposing more than tabs, windows and URLs.

The reporting bit of the extension could be as simple as a bunch of listeners a la:

  chrome.tabs.onSelectionChanged.addListener(
    (tabId, props) => fetch('http://localhost:8118/report?'+JSON.stringify([tabId, props])));