Enigmail has been blocked for your protection.

Why was it blocked?
This add-on causes a high volume of crashes and other stability issues. Users should update Enigmail.
Who is affected?
Users of Enigmail versions older than 0.97a for Thunderbird 3 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.