PDF Browser Plugin 2.4.2 and below has been blocked for your protection.

Why was it blocked?
The PDF Browser Plugin is causing frequent crashes on Firefox 18 and above. All users are recommended to keep the plugin disabled and update it if a new version becomes available.
Who is affected?
All Firefox users on Mac OS X who are using the affected versions of the PDF Browser Plugin.
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.