So far, all it has done is waste paper. With everything I print, an extra page prints with only "VTZilla 0% x" on it. There are no print setting in the extension. I can't find any mention of it on the internet and the Virustotal website contact page won't submit my issue. I did find that I could submit it in Chrome, which isn't good for a Firefox (56) extension. I'm waiting to hear from them but for now, it's costing me money so I have to disable it.