Downloading data from google finance using selenium (Python)

I am trying to download stock data from Google Finance using the selenium module. Is there a way to use Google Chrome for this, or do I have to use Firefox by calling browser = webdriver.Firefox() ?

Secondly, if I have to use firefox is there a way to default the browser to download rather than ask for permission everytime? I have tried to do this by opening a Firefox browser and changing the options, but it doesn't seem to stick when I run my script.

Thanks in advance for the input.