YouTube Unblocker before 0.6.17 has been blocked for your protection.

Why was it blocked?
Versions of YouTube Unblocker before 0.6.17 are vulnerable to MITM attacks, potentially compromising the user's profile directory. The latest version approved on addons.mozilla.org doesn't have this problem.
Who is affected?
All users who have versions of this add-on older than 0.6.17.
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.