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There are a couple in jailbreak but the only one I'm using with my iPad is called Activator. It's not specific to the home button- you can assign app launches and other actions to all the buttons (home, sleep and volume up/down) as well as gestures, like swipe from bottom of the screen, pinching and spreading the screen and tapping or swiping the status bar. Each activation has several different modes, like tap, tap hold and double tap. There are also settings for the three types of screen modes- i.e. Global, Lock Screen, Home (main screen with all you icaon- also called the Sprinboard) and within an app.You can change it to control the iPod, Home, or Search instead in general settings (on double click only though). There is a jailbroke app that allows you to assign further gestures to it I think, but I can't remember what it's called. I don't think it gets that specific though, like "when in a browser, do this".
If pressing the home button while in Safari made it go back a page, how would you ever get out of Safari?
If pressing the home button while in Safari made it go back a page, how would you ever get out of Safari?