風吹くままに

An advantage of Firefox against InternetExplorer is all the free extensions called "add-on." However, IE also has a few free add-on. If you are a IE7 user, I recommend using IE7Pro.
This is an add-on for IE7 and includes several useful features. It's free.

IE7Pro includes Tabbed Browsing Management, Spell Check, Inline Search, Super Drag Drop, Crash Recovery, Proxy Switcher, Mouse Gesture, Tab History Browser, Web Accelerator, User Agent Switcher, Webpage Capturer, AD Blocker, Flash Block, Greasemonkey like User Scripts platform, User Plug-ins and many more power packed features. You can customize not just Internet Explorer, but even your favorite website according to your need and taste using IE7Pro.

Download and more details
http://www.ie7pro.com/