Blockify is an open source Firefox browser add-on that can detect if a web application has been tampered with.

Blockify does this by verifying all of the files downloaded to the browser against published checksums, detecting changes or updates, and automatically blocking the execution of suspect code.

Combined with a "host-proof" web application, Blockify helps protects against man-in-the-middle attacks, server security breaches, and insider attacks, even if they have already compromised the files on the web server itself.

You do not currently have Blockify installed. Download the Blockify extension now. If you have already downloaded and installed Blockify, ensure the add-on is enabled.