Adobe Reader XI for Mac OS X has been blocked for your protection.

Why was it blocked?
The Adobe Reader XI plugin is causing frequent crashes on Firefox for Mac OS X. The impact and this block are currently limited to versions 11.0.0 and 11.0.01.
Who is affected?
All Firefox users on Mac OS X who have installed the Adobe Reader XI plugin. Users are recommended to update when a new version of Adobe Reader becomes available, or to downgrade to the latest version of Adobe Reader 10.
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.