Ok, this is becoming annoying. Because I like to keep my thumb at the bottom of the trackpad for pressing the button. If my thumb is touching the pad while I'm using my other finger to move the pointer about the screen, then resizing occurs. And it happens so quickly, that it is difficult to return to the original size. This happens at least in Safari. Now I just discovered that zooming is also done by pressing the 'control' key and moving two fingers up and down on the trackpad. This type of zooming is much more smooth and it is very easy to return the zoom to the original size. It is a very nice feature. The other type sucks. Is there an option somewhere to turn the other 'finger spread' zoom off?