change url of a tab using apple script
Solution 1:
A way to do it with Chrome's built in scripting:
tell application "Google Chrome" to set URL of active tab of window 1 to "http://example.com"
And to expand your script to press return:
tell application "Google Chrome"
tell application "System Events"
tell application process "Google Chrome"
set (text field 1 of toolbar 1 of window 1)'s focused to true
set value of text field 1 of toolbar 1 of window 1 to "http://example.com/"
keystroke return
end tell
end tell
end tell