Waterfox is a discontinued web browser based on the Gecko rendering engine, the same engine that powered Firefox. However, unlike Firefox, Waterfox was designed to be a 64-bit browser from the start, offering performance improvements and better memory management, especially on 64-bit operating systems. It also aimed for a more privacy-focused experience, although the extent of this varied across its different versions.

Key features (in its active days) often included :

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64-bit Architecture:

This was its core differentiator and selling point.
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Customizability:

Users could extensively customize the browser[SQ]s appearance and functionality through extensions and settings.
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Privacy Focus:

While not as aggressively privacy-focused as some other browsers, it often emphasized avoiding telemetry and tracking.
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Gecko Engine:

This ensured compatibility with a wide range of websites and web standards.

Why it[SQ]s no longer actively developed:

Waterfox[SQ]s development has ceased due to various factors, including difficulty in maintaining compatibility with the constantly evolving web standards and challenges in supporting the Gecko engine independently. The project ultimately faced technical difficulties and developer burnout. There are some unofficial community forks, but they are not supported by the original developers and carry security risks.

In short, Waterfox was a niche browser targeting users who prioritized 64-bit performance and customization, but it[SQ]s important to understand it[SQ]s no longer actively maintained and therefore not recommended for general use due to security vulnerabilities.