RelevantKnowledge and lower has been blocked for your protection.

Why was it blocked?
Old versions of this add-on are causing startup crashes in Firefox 23, currently on the Beta channel. RelevantKnowledge users on Firefox 23 and above should update to version of the add-on.
Who is affected?
Users of Firefox 23 or later who have RelevantKnowledge or lower.
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.