I've been using Firefox for probably 15 years and this is the first review that I think I've written for an add-on. I don't have the expertise to parse the code for potential issues, but the linked webiste checks out and this add-on has big potential and is original in what it offers. It'd be nice to be able to zoom in on the sliders to get more precise, but hey, this is an ADD-ON for goodness sake! Very impressed and will check out more on your site soon. Thanks!