Http Get Method 'Urls that load up on the page' vb.net

I'm trying my best to make a program in visual basic similar to the Firefox Addon 'Live Http Headers', but I can't find what I need on Google. After some days and hard work I manged to do the Post Method, but I can't seem to understand how the Get Method works. I have a web browser on my program and I want to catch the Http headers as I'm navigating through websites. I'm mostly looking for the URLs that load up when viewing a website. I will show you an example.

This is with the Firefox Addon after loading the site

http://i.imgur.com/Xa4mn.png



http://i.imgur.com/xcwxU.jpg


How do I make my Web Browser gather the URLS as I'm jumping from one site to another? I hope I made myself clear, and yes I will be grateful if someone guides me through this. Thanks in advance.