auto-plugin-checker has been blocked for your protection.

Why was it blocked?
This add-on reports every visited URL to a third party without disclosing it to the user.
Who is affected?
All users of this add-on. If you wish to continue using it, you can enable it in the Add-ons Manager.
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.