If the first suggestion does not work correctly then the only other way I can think of at the moment is:
1. In Firefox Goto Edit then Select All then right click and select copy
2. If you have Notepad / Wordpad on your system open this then select edit and paste your copied web page.
You may have to do some (a lot!) editing to tidy it up though!
EDIT: this site PrintWhatYouLike may do just what you want - just enter the URL into the box and select options you require