The moveBy() method of the Window interface moves the current window by a specified amount.

• deltaX is the amount of pixels to move the window horizontally. Positive values are to the right, while negative values are to the left.
• deltaY is the amount of pixels to move the window vertically. Positive values are down, while negative values are up.

None (undefined).

This example moves the window 10 pixels to the right and 10 pixels up.

function budge() {
  moveBy(10, -10);
}

As of Firefox 7, websites can no longer move a browser window in the following cases:

1. You can't move a window or tab that wasn't created by Window.open().
2. You can't move a window or tab when it's in a window with more than one tab.

• Window.moveTo()