Is there no keyboard interface for Firefox and Safari “drop-down” windows?

Question

I switched to using OS X over a year ago and not being able to do some things with the keyboard, having to use the TouchPad on my MacBook Pro is just irritating. Like a tiny splinter in my finger every time I "bump" into a drop down dialog box in the browser that requires Submit or Cancel. In other pop-up windows, and just about ever other interface, I can use the keyboard to interact with the form or buttons. What is the keyboard interface for interacting with these browser drop-down panels? See the following screen capture:

Answer 1

System Preferences > Keyboard > Keyboard Shortcuts tab > enable Full Keyboard Access at the bottom as in the shot below:

http://cl.ly/3Oem