Cisco WebEx add-ons has been blocked for your protection.

Why was it blocked?

A critical security vulnerability has been discovered in Cisco WebEx add-ons that enable malicious websites to execute code on the user's system.

Who is affected?

All Firefox users who have any Cisco WebEx add-ons installed.

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.