Do you use a separate browser session when an AI tool checks your UI?

Separate profile, definitely. Keep personal cookies, autofill, saved cards, and unrelated tabs out of it. A clean profile also lets you see what a new visitor gets instead of accidentally testing with your usual session.

For pages that require a login, use a test account in that separate profile rather than your real account. Think of it like a test laptop: give the tool enough access to do the job, but nothing unrelated.

The fiddly bit is keeping the test account and its data representative of the states you want to check.

A temporary session that gets reset after the task is a good default. Give it a clean download folder too, and check what permissions it has for location, clipboard access, and screenshots.

A separate profile helps with browser data, but check the tool's actual sandbox and permissions rather than assuming the profile isolates everything.

Another option is to have the AI write browser tests, then review the tests before running them yourself. That keeps the AI from directly controlling the browser, although you still need to decide what account and data those tests can access.