Is it possible use a swipe gesture to navigate forwards and backwards in apps that do not natively support that gesture?
2 Answers
No. Each application needs to define what forward and back are and then enable the gesture recognizer to map those commands.
You can emulate a keyboard shortcut pressing on a swipe gesture using apps like BetterTouchTool but you will have to specify Swipe to Keyboard Shortcut mapping for every app.