Java Plugin has been blocked for your protection.

Why was it blocked?
These versions of the Java plugin are no longer supported by Oracle and cause a high volume of Firefox crashes.
Who is affected?
Users of Java 2 Plugin versions 1.5_00 to 1.6_99 in Firefox 3.6 and later.
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.