Java Plugin 1.7u7 (Mac OS X) has been blocked for your protection.

Why was it blocked?
The Java 7 Runtime Environment, update version 7, has a serious security vulnerability that is fixed in the latest update. All Firefox users are strongly encouraged to update as soon as possible. This can be done on the Plugin Check page.
Who is affected?
All Firefox users who have the Java 7 plugin, updates 7 and below.
What does this mean?

Users are strongly encouraged to disable the problematic add-on or plugin, but may choose to continue using it if they accept the risks described.

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.