Link introspection (when API key is added) breaks comments on Amazon wishlist entries by inserting HTML in comment area. No way to retroactively upload file, nor see upload history. VT file upload auth prompts are considered to originate from visited site, and thus can be subject to "Don't allow from this site" option on per-site basis, reducing security. Need instead to originate from extension.

Neat addon for faster checking links and downloads with VT. Sadly there is currently a bug that breaks some websites when this addon is installed (for ex.: paypal sign-in not working). Also using this addon besides script-blocking addons (for ex.: uBO) breaks some functions of VT4Browsers (for ex.: sidebar). If those things get fixed i gladly will use this addon again but for now i uninstalled it because of the problems described above.

Re: the first screenshot at
https://photos.app.goo.gl/1nMuJUd49GHaC7kq6

VTZilla defaults should be more privacy-sensitive.

I did not realise that simply saving a file would result in analysis.

For example (luckily, not a file that should have been private):
https://www.virustotal.com/#/file/e4718970b1f5ae9398840d01865af79c7f66d57ba6c46d979981c9f2bb781433/detection