The document discusses various web browsers including:
- Internet Explorer, the default browser included with Windows operating systems. The last version was Explorer 9.
- Mozilla Firefox, a free and open source browser descended from Mozilla. As of 2011 it had 30% worldwide usage.
- Google Chrome, a browser developed by Google that uses the WebKit layout engine. It passed 10% worldwide usage in 2011.
- Opera, a browser and internet suite that handles common tasks. It is offered free of charge. The last version discussed was from 2006.
- Safari, Apple's default browser included with Mac OS X. It is also the native browser for iOS. The latest version at the time was 5.0.4