Writing a non-GUI bot using Mozilla Framework

_x000D_ _x000D_ I'm looking for a way to write a non-GUI bot using Mozilla Framework. The bot should be able to work like normal browser (automatically download relevant JS files, make XMLHTTPRequests, run JS operations, modify DOM), except no GUI will be needed. I wonder if it is possbile to build XULRunner without X, GTK/KDE (without any GUI dependencies), as I will run the bot on FreeBSD server 6.4. It may sound a bit weird but I need a bot with capacity to operate like browser, runs JS, modifies DOM, submit forms running on non-GUI environments. I've looked into other browsers such as Lynx, Links, Hulahop, Chrome V8 engine, WebKit JavascriptCore but yet to find desirable output. It's a part of school project, thesis. We will use to observe price change of budget airlines and after one year long data collection, we need to deduce pricing strategy and customer behavior. It is a serious Final Year Project. Any hint or help is greatly appreciated! Thank you in advance! Regards.