After installing the extension, restart Firefox and browse to the game’s web page. Depending on the cheat, they will either be activated automatically, or you may need to activate them using the leethax UI. Visit the respective game’s page on this website for detailed instructions (see the list above).
If “nothing happens” when you try to install the extension, look for the yellow bar or pop-up baloon near the top of the page.
Don’t forget to restart Firefox after installing the extension.
Check the FAQ for any other problems.
To uninstall the extension (same as with any other Firefox extension), go to Tools → Add-ons. See here for more information.
Install Extension! (Requires Mozilla Firefox)
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