Grease Monkey Script for Automated Downloads - SIMPLE - Long Term

Hi, I am looking for a quick simple project. I am looking for a Google Chrome Tamper Monkey or Mozilla Firefox Grease Monkey (GreaseMonkey) script to help with automated downloads. Please check the attached video to understand what I am looking for. I am looking for an automated way to download files from a membership site. All items to be downloaded One page at a time. If there is an easy way to automate it to take care of pagination, that would be fine as-well... but because the timeframe is limited, I am Ok with one-page at a time downloads. From the various options that are available: All downloads should be of the highest size HD quality only.