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What is browser isolation in web scraping?
Browser isolation runs each scraping session in its own sandboxed container, separate from your local machine and other sessions. When the session ends, the container is destroyed along with all its data.
| Risk | Without Isolation | With Isolation |
|---|---|---|
| Malicious JavaScript | Can reach local resources | Contained in sandbox |
| Session cross-talk | Cookies leak between sessions | Each session is independent |
| Crashes | One crash affects all sessions | Only that session is impacted |
| Data privacy | Scraped data persists on disk | Nothing left behind after use |
It matters most when running AI agents that generate browser scripts, scraping in parallel at scale, or handling pages with credentials.
Firecrawl Browser Sandbox isolates every session by default. Nothing runs locally, so there are no resource spikes on your machine and no risk to your infrastructure.
Last updated: Feb 23, 2026
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