Feb 2026
When runs share a browser, one job's cookies, local storage, or open tabs leak into the next. If run A logs into site.com and run B hits site.com, B might get A's session by accident. If A saves state in local storage, B inherits that state. If A opens five tabs and never closes them, B starts with five open tabs.
This sounds like an edge case, but it is a common source of flaky failures. A test that passes when run in isolation fails when run in parallel. A background job that works fine at 2am fails at 9am when other jobs are running. The failures are non-deterministic and nearly impossible to reproduce, because they depend on the exact sequence of other runs.
BrowserPilot gives every run an isolated, managed browser session that is created fresh and torn down after. One run does not see the cookies, local storage, cache, or open tabs from another run. This makes failures reproducible: if a run fails, the same input will fail in the same way, no matter what other runs are happening.
Isolation also makes it safe to run many tasks in parallel. You do not have to worry about one task's state leaking into another. You do not have to serialize your jobs or add sleeps between them. Just run them.
But isolation is not always what you want. Some workflows genuinely need to keep state across runs: staying logged in, carrying a session forward, remembering a form value from yesterday. For those cases, BrowserPilot offers persistent profiles — a deliberate exception to isolation.
A persistent profile is a saved browser state that you can attach to a run. It carries the cookies, local storage, and other state from a previous run into the new run. When the run finishes, the new state is saved back to the profile. This is useful for workflows that span multiple runs, but it also means a failure in one run can contaminate the next. Treat profiles as an explicit choice per workflow, not a default.