So, how does Leethax Net compare to other Firefox extensions? Here's a brief comparison:

Because modern Firefox versions use a different extension architecture (WebExtensions), the original leethax.net extension is largely obsolete unless you use older or specific alternative browsers. Current Compatibility & Workarounds

However, the ethical and technical standing of Leethax deteriorated for two primary reasons. First, the extension explicitly violated the Terms of Service (ToS) of many web-based games. For instance, AdVenture Capitalist ’s developer, Hyper Hippo Games, routinely patched against automation tools, viewing them as threats to their monetization model (which relies on microtransactions to skip waiting times). Second, and more critically for Firefox users, the extension began to face incompatibility with modern browser security protocols. As Mozilla moved toward Manifest V3 and stricter Content Security Policies (CSP), Leethax’s method of injecting scripts directly into the DOM (Document Object Model) became a security red flag. Firefox flagged the extension as potentially harmful, not because of malicious code, but because its behavior mirrored that of a cross-site scripting (XSS) attack vector.