Most popular idle games have moved to Steam or mobile platforms. Use legitimate mods from the Steam Workshop or third-party save editors (e.g., Save Editor Online for Cookie Clicker). These are safer than browser extensions because you export your save file, edit it offline, and re-import it.
Even if you force-install an old version, games like Cookie Clicker have received hundreds of updates since Leethax was last maintained. The JavaScript hooks the extension relied on have changed; the extension will either do nothing or crash the game tab.
Leethax.net received DMCA takedown notices from game studios. While automation isn’t always illegal, the extension violated Terms of Service (ToS) of every game it supported. The developer, facing potential lawsuits, pulled the site offline in early 2019.
As of today, leethax.net returns a blank page or a "server not found" error. The Firefox extension is dead—unless you run an ancient, offline copy of Firefox 56 on an air-gapped machine.
🚀 What is LeetHax? LeetHax is a powerful, lightweight browser extension designed to enhance your experience in incremental (idle/clicker) and browser-based strategy games. It provides safe, client-side automation to remove repetitive grinding so you can focus on the fun part of the game. leethax.net firefox extension
✨ Key Features:
🎮 Supported Games (Active Development):
🔒 Is this safe? Yes. LeetHax runs locally in your browser. It does not send any data to external servers. All automation simulates human input patterns to avoid detection by game logic. We never ask for login credentials.
🛠️ How to Use:
⚠️ Fair Use Disclaimer: LeetHax is a tool for personal enjoyment and progression. Avoid using it on leaderboards or competitive modes where automation is banned. Use responsibly.
📝 Permissions Explained:
Many games have community-supported bookmarklets. For example, open the developer console (F12) and paste:
javascript:(function()Game.cookies=Infinity;Game.cookiesPs=1e12)();
Note: This works only for client-side games and resets on page refresh. Most popular idle games have moved to Steam
If you landed here looking for a current solution to automate browser games, here are four legitimate (and some semi-legitimate) replacements:
Before its decline, the extension worked with:
Unofficial versions can inject scripts that log your keystrokes (including passwords) or redirect your search queries to affiliate ads. Because the extension requests permission to "access your data on all websites," a malicious version could steal your session cookies from Gmail or banking sites.