tab to select drop-down input box In any web browser in Mac OS X, how can I choose a drop-down form input box using the tab key? When I need to input many forms including a drop-down box, I preferred to use tab key and shift+tab to move between input elements in Windows systems.

Why is it impossible in Mac, and how can I do it?
Make sure you have this set (it's not the default) in Keyboard Preferences