Leethax was a browser extension (primarily for Chrome and Firefox) designed to automate or simplify certain actions in – most famously Fallout Shelter (the browser version) and earlier Travian , Ogame , and similar resource‑management games.
Some users found success using Waterfox , an independent Firefox fork that maintained support for older XPI extensions longer than the main browser. How It Works leethax extension
💡 Avoid sites claiming to have a "Chrome version" of leethax; the original was built specifically for the Firefox architecture and many modern "clones" are actually phishing attempts or adware. Leethax was a browser extension (primarily for Chrome