Headless Browser for Python (Javascript support REQUIRED!) [closed]

I need a headless browser which is fairly easy to use (I am still fairly new to Python and programming in general) which will allow me to navigate to a page, log into a form that requires Javascript, and then scrape the resulting web page by searching for results matching certain criteria, clicking check boxes, and clicking to download files. All of this requires Javascript.

I hear a headless browser is what I want - requirements/preferences are that I be able to run it from Python, and preferably that the resultant script will be compilable by py2exe (I am writing this program for other users).

So far Windmill looks like it MIGHT be what I want, but I am not sure.

Any ideas appreciated!