How to get chrome.tabs.executeScript to work

Just started my experimentation with Chrome extensions and got stuck at this point: chrome.tabs.executeScript will just not work!

In the Chrome error console I kept getting this error:

Error during tabs.executeScript: Cannot access contents of url “http://google.com”. Extension manifest must request permission to access this host.

Create a simple Google chrome extension

var fbShare = {url: ‘http://sree.cc/browsers/create-a-simple-google-chrome-extension’,size:’large’} How to create a simple Google chrome extension
This tutorial helps you to go through the easiest way of creating a simple extension for Google’s newly launched browser “Chrome”.  Basically this browser extension adds an icon to Google Chrome Toolbar which when clicked will displays the recent tweets of a [...]