I assume you're using a Mac if you are using Safari. If you want to hack a game playing on your browser, I suggest you look into "ihaxgamez" It's a application similar to cheatengine; you can use it to change variables in a running program. It's native to Mac OSX btw. Here's the website if you're interested: http://www.ihaxgamez.com/iHaxGamez/Welcome.html