Download Virus Checker+ от OT

This is the upgrade version of Download Virus Checker by James Fray: https://addons.mozilla.org/en-US/firefox/addon/download-virus-checker/

Features:
- Use custom API key. I highly recommend you to use your personal VirusTotal API key because the default key is limited to 4 requests per minute.
- Scan mode: File (limit file size is 32Mb) or URL.

VirusTotal API document: https://developers.virustotal.com/v2.0/reference#public-vs-private-api