Javascript fix, must know how to debug HTTP requests

I wrote a Google Chrome Extension that scrapes some content from a website (chrome extension can make cross origin XHR requests), the website creates heaps of different tokens that I scrape to make a secondary request to their server that gives me the content I need. The problem is I'm missing some of the tokens that need to be sent in the header or the second request and therefore it keeps failing. I'm having trouble figuring out how the site generates these tokens that I need to scrape and I'm looking for someone to complete this part of the code. You must have experience debugging HTTP requests and dealing with complex Javascript. All the javascript on their site is minified and your really going to have to dig through it to figure out how we can scrape this data.