Arc Is Shutting Down: Build Browser Automation That Survives the Browser

Description and use

Automation on Arc must migrate to the Chromium engine, export session state, and keep it outside sync to avoid data loss and fingerprint changes when the browser shuts down.

Problem

Browser automation scripts built on Arc must migrate before the browser stops working, or they risk breaking due to lost sync, session data, and fingerprint changes.

Outcome

By targeting the Chromium engine and persisting session state, automation workflows survive Arc’s shutdown with minimal breakage, avoiding sync loss and fingerprint changes.

Workflow

• 1. Identify scripts that automate Arc’s UI or rely on Arc sync. 2. Refactor scripts to drive the Chromium engine via Playwright/Puppeteer, pinning the browser channel or executable path. 3. Export authenticated session state after each successful login using context.storageState(). 4. Store the exported JSON on disk, encrypted if needed. 5. Import the storageState in new Chromium builds before performing work, verifying with a selector check. 6. Test any extensions on the target browser before migration day. 7. Adjust fingerprint‑sensitive signals (TLS, UA, navigator) to match the new Chromium version. 8. Update CI to vendor a specific Chromium build and record its version in logs. 9. Monitor for bot detection or 2FA prompts and adjust mitigations accordingly.

Evidence

Arc was a Chromium browser with a different shell: a sidebar instead of a tab strip, Spaces instead of windows, a command bar instead of an address bar.

Source

If your scripts drive the product — clicking Arc's sidebar, relying on a Space layout, scripting the command bar — they die with the product. If they drive the engine — Playwright or Puppeteer against Chromium, the Chrome DevTools Protocol (CDP), standard DOM and network APIs — they survive.

Source

Export on success, not on schedule. The storage-state file should be rewritten every time a login flow completes cleanly, so the newest file is never more than one successful run old.

Source

Keep sessions out of the browser's own sync. Arc's sync dying on November 23 — a month before the browser itself — is the cautionary tale.

Source