Thunder, 2.0.6 and lower has been blocked for your protection.

Why was it blocked?
Versions 2.0.6 and lower of the Thunder add-on are causing startup crashes on Mac OS.
Who is affected?
All Firefox users who have versions 2.0.6 or lower of the Thunder add-on installed on Mac OS.
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.