By the way, if you are using Firefox Extension Backup Extension (FEBE) 2.0, you might want to check to see that it is in fact backing up the data. As far as I can tell there is no automatic backup setting. You need to go to Tools/FEBE/Perform backup to manually inovoke a proper backup.
I will modify the requirements in the posting to clarify that the printout should be on typical letter size or legal size paper. I did not have monster size posters in mind.
Yes, one dimension would be sized to fit the width of the page, and the other dimension would span multiple pages, preserving the aspect ratio of the original document.