I now consider this add-on all but abandoned. To be fair, it does technically work as described, namely for those that want to implement their own small custom personal scripts. The issue is that the plugin is completely tied into their userstyles site, which has been absolutely crippled for years. It is near impossible to get the pages to load, and without that ability there is no way to find and download professional themes, or access support materials. Do yourself the favor and choose an option with developers that take pride in ownership over the quality of their work.