| Benchmark | Firefox 42.0 | Icedragon 42.0.0.25 | Delta | |-----------|--------------|----------------------|-------| | Kraken 1.1 (ms) | 1452 | 1589 | -9.4% | | JetStream (score) | 118.5 | 109.2 | -7.8% | | Speedometer (runs/min) | 34.2 | 30.1 | -12% | | Memory (6 tabs, MB) | 412 | 487 | +18% |
This was more granular than Firefox’s permissions manager and persisted across sessions.
Users who enjoyed IceDragon often highlighted its security-centric design and performance on older hardware:
A dedicated management hub for quick access to security configurations and DNS settings. comodo icedragon 42.0.0.25
: Primarily built for Windows, including legacy support for Windows XP, Vista, 7, and 8. Critical Security Advisory
For the general user in 2026, the simple and critical answer is: This software has been discontinued for years. It is built on a codebase that is nearly a decade old and contains dozens of unpatched security vulnerabilities that are well-known to modern malware. Using it today would be a severe risk, as it "does not contain security updates that may have been implemented in the more recent... base".
| Feature Aspect | Comodo IceDragon 42.0.0.25 | Mozilla Firefox (circa late 2015) | | :--- | :--- | :--- | | | Based on Firefox codebase | Proprietary Gecko engine | | Add-on Compatibility | Fully compatible with all Firefox add-ons | Native support for Firefox add-ons | | Primary Security Features | SiteInspector malware scanning, Comodo SecureDNS, privacy tweaks to core | Standard browser security features, sandboxing, and built-in phishing protection | | Default DNS | Uses Comodo SecureDNS by default for faster and safer browsing | Uses your ISP's default DNS | | Privacy Enhancements | Removed crash reporter and data submission modules for enhanced privacy | Standard privacy controls and telemetry options | | Performance | Designed to be lightweight; lower RAM usage reported (168MB with 10 tabs) | Standard memory usage, often higher than IceDragon in tests | | Known Issues (42.0.0.25) | Reported password saving bug, updates issues (download reverting to older versions) | No widespread issues reported for this specific version | | Benchmark | Firefox 42
Perhaps the most impactful feature for both security and performance was Comodo's SecureDNS service. By directing your internet connection through Comodo's DNS servers instead of your Internet Service Provider's (ISP), IceDragon offered several key benefits:
Tested on a contemporary system: Intel Core i5-4590, 8GB RAM, SSD, Windows 7 SP1.
While Comodo IceDragon 42.0.0.25 remains a highly capable tool for specific legacy environments, users must evaluate it within a modern security context. Because it is built on older core architecture, it lacks support for modern web standards like advanced HTTP/3 protocols and contemporary TLS configurations. It serves as an excellent case study in specialized browser hardening, but modern web use typically requires updated software to mitigate evolving online vulnerabilities. Critical Security Advisory For the general user in
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: Built-in tools were designed to minimize data leakage and prevent tracking, offering a more "hardened" version of the standard Firefox experience of that era.
It includes integrated tools like SiteInspector (malware scanning for links) and Comodo Secure DNS to filter malicious domains.
Neither replicates Icedragon’s aggressive certificate pinning or zone-based DOM storage firewall.