@Norman P I've used this to make them whatever size I want (2560 x 1440) :)
you can control the window size - there are hundreds of command line options for chrome (not quite so many for firefox)
1. How do I know what the height of the loaded page is, so i can set the height properly? I cant...
2. It require the Enduser to have Chrome installed. I cannot assume that this will be always the case.