To do this

Press this

Select the text in the Address bar

ALT+D

Display a list of addresses you've typed

F4

When in the Address bar, move the cursor left to the next logical break in the address (period or slash)

CTRL+LEFT ARROW

When in the Address bar, move the cursor right to the next logical break in the address (period or slash)

CTRL+RIGHT ARROW

Add "www." to the beginning and ".com" to the end of the text typed in the Address bar

CTRL+ENTER

Move forward through the list of AutoComplete matches

UP ARROW

Move back through the list of AutoComplete matches

DOWN ARROW