Get Fiddler to do your web debugging

It is a free web debugging tool that can see what is going between your computer and the Internet.
It can be used on any browser, system or platform.

These are Fiddler's key features:

• Web Debugging - PC, Mac or Linux OK
• Performance testing
• HTTP/HTTPS Traffic recording
• Web Session Manipulation
• Security Testing
• Supports multiple frameworks-.NET, Ruby, Java etc
• Not limited to PC also includes Mobile devices

Besides the above, you can also customize Fiddler.
Read all about Fiddler and download it from here.

For Internet Explorer it is an add-on, go here.