Why the Browser Engine Matters
Most antidetect browsers are built on top of either Chromium (Google Chrome's open-source base) or Firefox (Mozilla's engine). Some premium browsers offer both. The engine choice affects:
- Fingerprint authenticity — how real your fingerprint looks
- Detection avoidance — which detection systems you can bypass
- Extension compatibility — which browser extensions work
- Performance — speed and resource usage
- Automation — which frameworks integrate best
Chromium-Based Engines
Used by: Most antidetect browsers (MoreLogin, AdsPower SunBrowser, GoLogin Orbita, Dolphin Anty, Octo Browser, etc.)
Advantages
- Market share — 65%+ of real users use Chrome/Chromium, so Chromium fingerprints blend in naturally
- Extension support — full Chrome Web Store compatibility
- Automation — best support for Puppeteer and Playwright
- Updates — Chromium updates frequently, keeping fingerprints current
- DevTools — superior debugging capabilities
Disadvantages
- Homogeneity — since most antidetect browsers use Chromium, detection systems specifically target Chromium-based antidetect browsers
- Google connections — some Chromium features phone home to Google
- Resource usage — generally higher memory consumption
Firefox-Based Engines
Used by: Multilogin (Stealthfox), MoreLogin (Firefox kernel), AdsPower (FlowerBrowser), Kameleo (Firefox support)
Advantages
- Diversification — using Firefox when most antidetect browsers use Chromium provides natural camouflage
- Different fingerprint surface — Firefox generates fundamentally different fingerprints
- Privacy-first — Firefox's architecture is more privacy-oriented
- Lower detection — fewer detection tools specifically target Firefox-based antidetect browsers
- Lower resources — generally uses less memory than Chromium
Disadvantages
- Smaller market share — ~7% of users use Firefox, which can stand out in some regions
- Fewer extensions — smaller addon ecosystem
- Less automation support — some tools work better with Chromium
- Slower updates — antidetect browser vendors may lag behind Firefox releases
Browser Engine Comparison
| Feature | Chromium | Firefox |
|---|---|---|
| Real-world market share | ~65% | ~7% |
| Fingerprint diversity | Lower (everyone uses it) | Higher (stands out less in antidetect) |
| Chrome extension support | ✅ Full | ❌ Limited |
| Puppeteer support | ✅ Native | ⚠️ Partial |
| Playwright support | ✅ Full | ✅ Full |
| Selenium support | ✅ Full | ✅ Full |
| Memory usage | Higher | Lower |
| Detection targeting | Higher (more tools target it) | Lower |
When to Use Each Engine
Use Chromium when:
- Your target platforms primarily see Chrome traffic
- You need Chrome Web Store extensions (MetaMask, etc.)
- You're using Puppeteer for automation
- You want the broadest compatibility
Use Firefox when:
- Detection systems are specifically targeting Chromium-based antidetect browsers
- You want to diversify your browser fleet
- You're operating in regions where Firefox has higher usage (Germany, etc.)
- You want lower resource consumption per profile
Browsers with Dual Engine Support
| Browser | Chromium Engine | Firefox Engine | Switch Between |
|---|---|---|---|
| MoreLogin | ✅ Main | ✅ Available | Per profile |
| Multilogin | ✅ Mimic | ✅ Stealthfox | Per profile |
| AdsPower | ✅ SunBrowser | ✅ FlowerBrowser | Per profile |
| Kameleo | ✅ Chroma | ✅ Junglefox | Per profile |
Best Strategy: Mix Both
The optimal approach is to use both engines across your profiles:
- Create 70% of profiles on Chromium (matching real-world browser share)
- Create 30% of profiles on Firefox (for diversification)
- Rotate between engines for different accounts and use cases
- If an account gets flagged on Chromium, try Firefox (and vice versa)
Bottom Line
Chromium is the default choice for most users — it has broader compatibility and blends with the majority of real web traffic. Firefox becomes valuable when you need diversification or when detection systems are specifically targeting Chromium antidetect browsers.
Browsers like MoreLogin, Multilogin, and AdsPower that support both engines give you the most flexibility.