I want to retrieve the text that the user has typed into the currently visible address bar, using Javascript. This is for google chrome only.
Is this possible? I kno
Even with extensions this is impossible -- at least in google chrome.
Under the current extensions platform for Chromium, addons are little more than javascript programs with minorly elevated privileges; the nearest correspondence would be the Greasemonkey scripts so popular in Firefox.
As an extension developer, I am very unhappy with this situation, and am looking forward to its (inevitable) change and growth.
For the moment, unfortunately, such things as your question are completely impossible.