Comodo Icedragon 42.0.0.25 -

Out of the box, IceDragon 42.0.0.25 routed DNS queries through Comodo’s SecureDNS servers (by default, unless manually disabled). This meant that even if you typed a malicious URL, the DNS resolver would refuse to resolve the address, effectively blocking malware command-and-control servers before the HTTP request was made.

Disclaimer: Installing end-of-life browser software on a machine connected to the modern internet is highly dangerous. This section is for archival or virtual machine experimentation only.

If you possess the .exe installer for version 42.0.0.25 (approx. 45 MB), here is the procedure for running it on a modern Windows 10/11 system: comodo icedragon 42.0.0.25

Critical Warning: Do not log into modern websites (banking, email, social media) using this browser. The TLS cipher suites supported in Firefox 42 (TLS 1.0/1.1) are deprecated and insecure. Many modern HTTPS sites will not even load, returning a ERR_SSL_VERSION_OR_CIPHER_MISMATCH.

Tested on a contemporary system: Intel Core i5-4590, 8GB RAM, SSD, Windows 7 SP1. Out of the box, IceDragon 42

| 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% |

The slowdown came from:

In practice, the browser felt sluggish on image-heavy or script-heavy sites like Facebook and YouTube. On text-centric sites (Wikipedia, forums), the difference was unnoticeable.

Located on the browser toolbar is a shield icon. When you visit a website—even one you aren't sure about—you can click this icon to launch the Inspector. Critical Warning: Do not log into modern websites

This feature performs a real-time, on-demand scan of the webpage using Comodo’s cloud servers. It analyzes the page for: