Web Security and others has been blocked for your protection.

Why was it blocked?

Sending user data to remote servers unnecessarily, and potential for remote code execution. Suspicious account activity for multiple accounts on AMO.

What does this mean?

The problematic add-on or plugin will be automatically disabled and no longer usable.

When Mozilla becomes aware of add-ons, plugins, or other third-party software that seriously compromises Firefox security, stability, or performance and meets certain criteria, the software may be blocked from general use. For more information, please read this support article.