Java Plugin 8 update 64 to 76 (click-to-play), Mac OS X has been blocked for your protection.

Why was it blocked?
Old versions of the Java plugin are potentially insecure and unstable. All users are strongly recommended to update on our plugin check page.
Who is affected?
All users who have these versions of the Java plugin 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.