Recently, I moved to Ubuntu from Wdoz and working on firefox. I understand that using firefox developer toolbar, I can look into various cookies that websites put on my computer. But, I cannot figure out how to understand them? What are the information that are stored and transmitted to the servers? For example, if I am on youtube, there are some keys and values. Some of them, like key "recent ply list", are understandable but not all. How do I know what exact information, for example, youtube is getting from cookies? And, of course, it would be great if I can get some Ubuntu-specific solutions.