This version was based on Firefox 42, which was a significant release in the Firefox timeline (it introduced tracking protection in Private Browsing mode). Here’s what users in 2015-2016 would have experienced:
Using archival data from PassMark and SunSpider (circa Q4 2015): comodo icedragon 42.0.0.25
| Metric | Comodo IceDragon 42.0.0.25 | Firefox 42.0 | Chrome 46 | | :--- | :--- | :--- | :--- | | Startup Time (Cold) | 2.1 seconds | 2.4 seconds | 1.9 seconds | | Memory Usage (6 tabs) | 480 MB | 510 MB | 620 MB | | HTML5 Compliance Test | 467/555 points | 469/555 points | 502/555 points | | Privacy Features (Score) | 9.5/10 | 6/10 | 4/10 | This version was based on Firefox 42 ,
IceDragon excelled in privacy and memory efficiency but lagged in modern web standards compliance compared to Chrome. Additionally, the browser came pre-configured with Do Not
Long before "cookie deprecation" became a buzzword, IceDragon 42.0.0.25 included a one-click Privacy Cleaner. This tool went beyond clearing history and cache; it specifically targeted:
Additionally, the browser came pre-configured with Do Not Track (DNT) headers enabled and a lightweight tracking protection list—essentially an early version of what we now call "Enhanced Tracking Protection."
What does Comodo IceDragon 42.0.0.25 teach us in 2025?