Turn on "Allow user scripts" with these three steps and the extension can run the scripts you install.
Click browser "Extensions" → "Manage extensions", or visit chrome://extensions
On PC click "Details"; on mobile tap the menu on the right.
Find the "Allow user scripts" toggle and turn it on. (On older browsers, enable "Developer mode" in extension management.)
The check runs locally in your browser; nothing is uploaded.
Open the tutorial and describe what you want — the AI writes your first script in an experiment area.
Open the tutorial Playground