Used this add-on for many years. But the last version (4.0.2) breaks the CSRF check on my "postfixadmin" (3.3.11) site. After sending the login credentials I get "Invalid token! (CSRF check failed)". As soon as I disable VT4Browsers the login works again.

Latest version breaks CSRF token of idp shibboleth servers. Impossible to use idp when plugin enabled.

It consumes your daily quota of API requests very fast (yes, because even if your answer 'No' to don't scan a downloaded file)

Great app. Saves you a few clicks, and the need of visiting virustotal.com

I only use it to easily go to Virustotal.com, but here's five stars anyway.

Relatively useless:
Files are not uploaded already above a size of approx. 145 MB (File exceeds maximum size).
Furthermore, it would be nice if user-defined file extensions could be defined.
And the website behind it doesn't work if the options for "Improved protection against activity tracking" are exhausted in Firefox.

حلو

please make it warn the user if threat was detected...

Error "Failed to communicate with VirusTotal" now. This was a great 4 1/2 star extension while it worked, although I supplemented VT4Browsers with Winja.