Java Plugin 1.7u7 (Windows) has been blocked for your protection.

Why was it blocked?
The Java 7 Runtime Environment, update version 7 and below, 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?

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.