Multilogin ships two proprietary browser cores — Mimic (Chromium-derived) and Stealthfox (Firefox-derived). Engine choice affects TLS fingerprint, CDP automation, extension support, and pass rate on fingerprint-clustering anti-bot systems.
Comparison
| Factor | Mimic | Stealthfox |
|---|---|---|
| Engine base | Chromium | Firefox / Gecko |
| Playwright CDP | Primary path — connect_over_cdp | Verify current MLX automation docs |
| Chrome extensions | Supported (varies by version) | Limited vs Chromium ecosystem |
| TLS / JA3 | Chrome-like handshake | Firefox-like handshake |
| Canvas / WebGL | Chrome GPU strings | Gecko renderer patterns |
| Typical pick | Default for automation teams | Diversify when Chromium farms blocked |
Decision tree
- Using Playwright/Selenium CDP? → Start with Mimic.
- Target site blocks Chromium TLS cluster? → A/B test Stealthfox profile.
- Need specific Chrome extension? → Mimic.
- Running mixed engine farm? → Tag profiles in workspace (agency guide).
Engine + proxy interaction
Mimic/Stealthfox do not fix bad proxies. Align geo before comparing engines — see proxy types and alignment.
Related
Disclosure: MLX-MMO affiliated with Multilogin. Engine features change between releases — verify in-app when upgrading.